It seems many #MSX musics have wrong pitch.
It is caused by bad ports from #CPC games. The Amstrad uses CLK/4 for the PSG (that is 1 MHz), while MSX computers have PSG clocked at CLK/2 (that is 3.57/2 = 1.78 MHz). This causes MSX musics to sound approximately 10 semitones higher than intended (-2 semitones due to the 4 vs 3.57 difference, and +12 semitones due to the extra clock division used in the #amstrad
I've just found this while helping Felix Espina fix the music of the game Coliseum.

