Guitarist's CoattailsG 10

I couldn't find Keyboard Cat. So I went to quickplay, plugged in all four instruments (make sure your profile is logged into the guitar), and selected Star Spangled Banner that is second from the bottom of your song list. Put everyone's on beginner, except your guitar and start the song. Simply play through on your guitar. You don't need to touch the other instruments, there is not enough notes to make them fail. The achievement should pop at the end of the song.