Rock Revolution

For efficiency's sake, you should combine this with Internship and More Tracks Please, since you'll have to be in the Recording Studio for those, anyway. However, you can do this by itself, too.

It's easiest to just use a regular controller.

1. From the main menu, choose Studio.
2. Choose Recording Session.
3. If you're doing Internship or More Tracks Please, follow that solution and then skip to step 8, below.
4. If you just want to get this achievement, press the Start button on your controller and then choose Playback Menu.
5. Choose Record.
6. By default, your controller is set to drums, so wait for the game to stop giving you the beat and then just press A A A or X X X to make some "music" (if you're using an actual instrument, then just hit a few notes).
7. Press Start to get out of instrument mode.
8. Press B to go back to the previous menu.
9. Choose Save/Load/Erase.
10. Choose Save Song.
11. Choose your save device.
12. Choose Save As A New Song.
13. Press the Done button to save the song title and the achievement should pop.

Easy as pie.