Meet the Etón rukus Solar.
It’s Bluetooth-enabled, so stream music from any phone or MP3 player that is compatible. It even has an internal lithium battery, so when the sun goes down, you can still have 8 hours of music. It has two speakers and a bass boost button, as well as an AC adapter and a USB port, so you can charge your mobile/music device.
(It also comes in black and lime green!)