The series I've been into the most has been Rock Band but I'm quite a big fan of rhythm games. Besides Rock Band, series I've played include:
- Guitar Hero
- Phase Shift (basically Rock Band for PC)
- DDR
- Rhythm Heaven / Rhythm Tengoku
- Project Diva
- Final Fantasy Theatrhythm
- Elite Beat Agents / Osu! Tatakae! Ouendan
- Audiosurf
- Rez
- Child of Eden