Currently the music related output from Lego themselves is very limited. Which is strange given the huge amount of revenue that music and various spin-offs could potentially make. Think about all the popular musical artists current and past that could be legofied into a stage or other set.
I really hope that there will be more music related spinoffs by LEGO in the near future.
In the mean time, here are the only seven official popular music/musical related LEGO building sets.