The Beatles Rock Band

Right of the bat let me say that you should attempt this achievement playing on medium at the highest unless singing is your profession. If it isn't hard enough to sing, you have to do it with another person singing the Harmony parts to every song which can get confusing.

When you've found a friend to sing with you, you need to play through 14 songs and obtain every single 'Double Fab' rating possible, which basically means near-100%'ing most songs in the list.

The Main player sings the Blue Bar of the song and the Harmony player sings the Orange Bar. You'll both be on Easy or Medium most likely so it should be easy enough to sing your part, but the trick for both of you is to not to listen to each other but to your part coming from the TV.

If you miss a double fab in a song you should restart on the spot and if you continuously miss it you should try practicing it.

The 14 songs you have to get all the Double Fab ratings for are:
1. A Hard Day's Night
2. Come Together
3. Dig A Pony
4. Eight Days A Week
5. Get Back
6. Hey Bulldog
7. I Am The Walrus
8. I Me Mine
9. I Saw Her Standing There
10. I Want To Hold Your Hand
11. I'm Looking Through You
12. I've Got A Feeling
13. Something
14. Ticket To Ride

...Good Luck!

*!*EDIT*!*: Another point of interest is who earns the achievement when you're finished. The person who is signed in and has their controller turned on to the Vocalist part is the person who earns the achievement. The other person could even be signed in with another controller but there's only one vocalist spot thus only one achievement. (Sucks.)

You probably should do all those songs again to get him his achievement. I mean just leaving him hanging would be a douche move, eh?

*!!*EDIT 2*!!* Quoting: "It should be noted that you can do this with three people and they can help get phrases as well. We had three mics doing the songs with two vocal parts and it does work, really well actually, so if you have trouble with two people, try it with three."
Credit to scaredskullkid

She Still Sings It with the Band
Get all possible Double Fab ratings for every song with 2 vocal parts.

If you have a partner, you should go with Davey the Rebel's solution. If not, heres how to do it alone. Two playthroughs required:

1st off you need a PC or any other recording device. I used a PC with a freeware recording program called Free MP3 Sound Recorder: http://www.nbxsoft.com/

Now you will need your two mics. Connect one to your xbox and the other to your PC(not nessesary if using a different recording device)

Now play each song on Harmonies/Easy doing only the main/blue part. Sing into both mics after you hit record on your recorder. I synced by hitting the record button just as the vocals started.

If by the end of the song you scored 100%, your all good.

Now connect your 2nd mic to the xbox, and place your 1st mic infront of your recorder/PC speakers. Play the song again, this time letting your previous recording do the blue part, while you do the brown/orange part on the second mic.

I got all the harmonies on 13 of 14 songs this way. By the time of writing Im still struggeling with "I've Got A Feeling", but thats because of a complete lack of skill lol

Good Luck!

EDIT: Got the achievement now. Turns out Free MP3 Sound Recorder isnt free after all and stops working after about 15 recordings. Use Free MP3 Recorder ( http://www.tucows.com/preview/506678 ) instead.

Here are all of the 2 and 3 part files in a 100mb ZIP. You obviously still have to sing when it comes to the 3-part. One speaker channel is a part. So left, right, then you.

Read through the forums to get an idea of everything. I believe it does the Blue and Orange lines. And you should play them through a stereo with a CD or iPod with no equalizers or anything turned on.

http://www.megaupload.com/?d=75ZMP6MM

Credit goes to this post: http://www.xbox360achievements.org/forum/showthread.php?t=17...

She Still Sings It with the Band
Get all possible Double Fab ratings for every song with 2 vocal parts.

If you have a partner, you should go with Davey the Rebel's solution. If not, heres how to do it alone. Two playthroughs required:

1st off you need a PC or any other recording device. I used a PC with a freeware recording program called Free MP3 Sound Recorder: http://www.nbxsoft.com/

Now you will need your two mics. Connect one to your xbox and the other to your PC(not nessesary if using a different recording device)

Now play each song on Harmonies/Easy doing only the main/blue part. Sing into both mics after you hit record on your recorder. I synced by hitting the record button just as the vocals started.

If by the end of the song you scored 100%, your all good.

Now connect your 2nd mic to the xbox, and place your 1st mic infront of your recorder/PC speakers. Play the song again, this time letting your previous recording do the blue part, while you do the brown/orange part on the second mic.

I got all the harmonies on 13 of 14 songs this way. By the time of writing Im still struggeling with "I've Got A Feeling", but thats because of a complete lack of skill lol

Good Luck!

EDIT: Got the achievement now. Turns out Free MP3 Sound Recorder isnt free after all and stops working after about 15 recordings. Use Free MP3 Recorder ( http://www.tucows.com/preview/506678 ) instead.

The Only way I found this easy is just have whoever is singing with you sing your parts and vice versa. If one players messes up and the other hits the note it still counts. Some songs where you have to sing 2 different parts at the same time can be a bit more difficult but the next free moment you get sing your buddy's part.

I've Got A Feeling was the most difficult for me but singing it together makes it way much more easier then singing your own parts.

-Play on easy
-I've Got a Feeling is hardest, I would advise practicing so you don't screw up at the end
-You don't have to sing the same part the whole song: i.e. you and your partner can switch colors (most helpful for I've Got a Feeling and I Saw Her Standing There)
-Sometimes it helps to sing in the same voice as the original (also helps for I've Got a Feeling for the Paul McCartney part)
-Sometimes one person should start singing a second earlier to ensure the game recognizes which person is singing which

The hardest part about getting this achievement is finding a friend willing to sit through it. You only have to play on Easy, and only have to play songs with Double fabs, you do not have to play every song. Also, you are not stuck singing strictly one part either, you and your partner can switch on and off of the main and harmony mid song if you think you can do the other part better.
It's just a matter of willingness to devote the time to practice.