The sound of soul and lo-fi
Electric pianos were built as portable, amplified alternatives to the acoustic piano, and ended up with a sound of their own. The Rhodes is the warm, chiming keyboard of 1970s jazz fusion, soul and R&B, and of today’s neo-soul and lo-fi hip hop. The Wurlitzer has a reedier, edgier tone heard in pop, rock and soul. Both respond strongly to how hard they are played.
Using electric piano samples
Single-note samples are most useful as a multisampled instrument: several notes and velocities mapped in a sampler, so you can play your own chords. Chord one-shots and loops are quicker for sketching. A Rhodes almost always sounds better with some movement, so add a tremolo or chorus, and a touch of saturation for the overdriven bark.
Some free electric piano sets come from vintage-instrument sample sites; others are community recordings with mixed licences. The verdict on each card tells you which are cleared for a release.