For a for more powerful audio playback for the Adafruit Speaker Bonnet for Raspberry Pi we suggest using PyGame to playback a variety of audio formats (MP3 included!)
Adafruit I2S 3W Stereo Speaker Bonnet for Raspberry Pi: Hey Mr. DJ! Turn up that Raspberry Pi mix to the max with this cute 3W Stereo Amplifier Bonnet for Raspberry Pi. (It’s not big enough to be an official HAT, so we called it a bonnet, you see?) It’s the exact same size as a Raspberry Pi Zero but works with any and all Raspberry Pi computers with a 2×20 connector – A+, B+, Zero, Pi 2, Pi 3, etc. We’ve tested it out with Raspbian (the offical operating system) and Retropie.