Adafruit "Music Maker" MP3 Shield for Arduino w/3W Stereo Amp Sensors Because the clock and data

Because the clock and data is separated

Some nice details include a ready-to-go cable and a machined drive shaft (so you can easily attach stuff)

each pixel is individually addressable

internal kickback protection diodes

these updated Flora NeoPixels have ultra-cool technology: these ultra-bright LEDs have a constant-current driver cooked right into the LED package

Adafruit "Music Maker" MP3 Shield for Arduino w/3W Stereo Amp Sensors Because the clock and dataBend all audio files to your will with the Adafruit Music Maker shield for Arduino! This powerful shield features the VS1053, an encoding decoding (codec) chip that can decode a wide variety of audio formats such as MP3, AAC, Ogg Vorbis, WMA, MIDI, FLAC, WAV (PCM and ADPCM). It can also be used to record audio in both PCM (WAV) and compressed Ogg Vorbis. You can do all sorts of stuff with the audio as well such as adjusting bass, treble, and volume