Charlene is again the easiest song, and is a free download from the marketplace. Playing on Super Easy, you only have to hit a few notes. If you can play on Easy very well then this achievement is nothing for you. Super Easy has Auto-Kick on and the achievement still unlocks.
Here is the super easy way:
Play Charlene on Super-Easy. Remember auto-kick is on, so no kick pedal needed. Now never ever use your star power. Because the Overdrive sections for drums take away some of the actual song, you don't have to even play those. This cuts the song in half. Making the ending, which is a line of yellows and reds, very very easy.
We Will Rock You is another very easy song on drums. It is just red notes. Simple and easy.