My level was something around 30? Iunno it was in-tents when it came to some of those songs man. My fingers still hurt a bit. As for some tips, try googling some help sites on o2jam. I know there are a few that should really help you play better ^_^.
theres a cheat there.. buy an epoints then sell it to make 1m+ gold... theres an equipment there 10 ep i think that sells around 2m+