Audio players, such as MP3 Shields, our favourite WAV Trigger and others.
WAV Trigger
Tsunami Super WAV Trigger
MP3 Trigger v2
MP3 Player Shield
VS1053 Codec + MicroSD Breakout - MP3/WAV/MIDI/OGG Play + Record
Adafruit Audio FX Sound Board - WAV/OGG Trigger with 16MB Flash
Adafruit "Music Maker" MP3 Shield for Arduino (MP3/Ogg/WAV...)
LilyPad MP3
Teensy Audio Adaptor Board for Teensy 3.X (Rev. C)
Adafruit Music Maker FeatherWing w/ 3W Amp - MP3 OGG WAV MIDI Synth Player
SparkFun Qwiic MP3 Trigger
Adafruit Audio FX Sound Board + 2x2W Amp - WAV/OGG Trigger -16MB
Adafruit "Music Maker" MP3 Shield for Arduino w/3W Stereo Amp - v1.0