GBA has a 16MHz 32-Bit Arm. The Game Boy original had a 4Mhz 8-bit cpu (but it really only ran at 1Mhz, since all instructions took a multiple of 4 clock cycles

GBA has a 16MHz 32-Bit Arm. The Game Boy original had a 4Mhz 8-bit cpu (but it really only ran at 1Mhz, since all instructions took a multiple of 4 clock cycles). But yes, not quite fast enough for mp3.