Yamaha PSR-90

The Yamaha PSR-90 is a portable keyboard synthesizer released in the early 1990s. It was popular among amateur and professional musicians alike, and was used by artists such as the Red Hot Chili Peppers, Radiohead, and the Beastie Boys.

The PSR-90 is a 61-key synthesizer with a built-in sequencer and a variety of sounds and effects. It has a wide range of sounds, including piano, organ, strings, brass, and drums. It also has a built-in arpeggiator and a variety of effects, such as reverb, chorus, and delay. The PSR-90 also has a built-in MIDI interface, allowing it to be connected to other MIDI devices.