The Audio Narration Add-On module allows your MakerBit projects to play audio (mp3 and wav files) even without a computer.
With the touch sensors, you can make a “piano” where each sensor plays a different note. Those notes can also be samples of any musical instrument. You can find the instructions for that here. With MakeCode, you can also program your own mp3 player with multiple songs and albums.
Here is a LEGO “Women of NASA” kit with LEDs and the audio narration kit to play different sound tracks when sensors in the model are touched. This was done with the HyperDuino, but the setup and results are the same as the MakerBit.