Yep, I also had this issue, where it would only play Reimu's day theme and had a static sound when it started playing. Through testing it just now with a fresh copy of that program, what I see is the issue is having "Remove opening silence" checked before you load up IaMP's songs, so uncheck it and then go back to IaMP and it should work. (which is weird because I remember solving this issue some time ago but this wasn't the answer, yet it works on a new copy and my original copy of the Music Room)