I wanted a music player with the following features:
- Inexpensive (less than $40)
- Low power (1 watt)
- Plugs in to a audio system (no batteries, not a portable player)
- Runs 24/7
- Automatically starts playing again after losing power
- Expandable storage
- Web interface
I built it on a Raspberry Pi Zero W. It is a full computer that is only 2 inches long