[linux-audio-user] Keyboard software and hardware

Hello, I'd like a simple keyboard for plonking out notes to help me learn my choral music. First, I'd like a piece of software that accomplishes this by using my usual PC keyboard. Second, I'd like actual keyboard hardware that can operate by itself, or connected to a computer through either USB or MIDI (preferably both). I don't want any extraneous features on the keyboard, although I'd be interested in hearing what features people find particularly useful. Velocity sensitive keys that feel like a piano to some degree would be a major plus, but that mostly depends on the difference in price. Any suggestions? Cheers! Shaun