@Everyone requesting music. If you can find a MIDI of the song, you can turn it into sheet music using a variety of programs widely available on the internet. Looking at the sheet music, if you see ANY accidentals, it is impossible to play on the flute. If the range (difference between lowest & highest note) is more than 2 octaves, it is also impossible to play on the flute. Of course if you can’t find a MIDI of the song, you could just look up sheet music for the song. That might be the easier route.
Suffice to say, most songs don’t work because they usually have key changes or accidentals. Furthermore, the flute cannot play rapid succession notes, so any song that is very fast pace or has very fast parts won’t sound right played on the flute. That will be all.
While “don’t request songs with accidentals” is good advice, I had to look up what that term even means, and I definitely can’t read sheet music well enough to replicate it in-game.
I requested this: http://musescore.com/user/22881/scores/38914#
Excusing the part where the tempo is too high, it should meet all of your criteria. If posting sheet music is more helpful to those of you who actually know what you’re doing, I’ll gladly oblige, but I wouldn’t be asking for someone else to do this for me if I knew how to do it myself.