The GBA may be more powerful than the SNES hardware-wise, but it lacks behind it in sound production due to it being not only held back by the OG Game Boy's miserable sound hardware, but because the GBA featured centralized hardware that it shared with all components of the system (video, audio etc.) Kind of like the N64 before it.
And no, I don't think you can play GBC-only games on the SGB. The GBC had slightly enhanced hardware over the original Game Boy, such as a faster processor. I do believe that a second SGB that allowed you to play GBC games on the SNES was released in Japan.

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