PowerGig Rise of the SixString

I can confirm that this can be achieved through a combination of songs played in both Quick-Gig and Unite the Clans game modes. I chose Swim by Surfer Blood as it was one of my favorite songs in the game, it was short and it was available from the very start of Unite the Clans. It's all up to you to decide which song you use though I would recommend using one given earlier on in Unite the Clans as it will be easier to achieve 10 plays.