Pretty good, but Game Maker can support MIDIs, maybe you could change the WAVs to MIDIs.

O.o whats the matter with you? too be honest midis are the worst choice for music, game maker is better then that, it supports like mp3s, and oggs i think, also theres an spc tool that will make game maker also do spc files which are super nintendo music files, your very much thinking of the older game makers, im sorry but are you really stuck that far into the past? anyways this is a great how-to.

MIDIs are small files, but bad quality, WAVs
are giant files and are awful quality (they are used for sound effects). What I am trying to say is if the WAVs change to MIDIs the file size will be much smaller and people will be encouraged to change the music as well. This is a how-to, so it is not a music fest to see how awesome the music quality can be, really for this it does not matter of the quality, just as long as this teaches people about scripts and Game Maker.

MIDIs are small files, but bad quality, WAVs
are giant files and are awful quality (they are used for sound effects). What I am trying to say is if the WAVs change to MIDIs the file size will be much smaller and people will be encouraged to change the music as well. This is a how-to, so it is not a music fest to see how awesome the music quality can be, really for this it does not matter of the quality, just as long as this teaches people about scripts and Game Maker.