The Yamaha PS-35S is a digital piano that was released in the late 1980s. It is a full-size, 88-key digital piano with a built-in speaker system. It has a range of features, including a built-in metronome, a transpose function, and a selection of voices and rhythms. It also has a MIDI interface, allowing it to be connected to other MIDI-compatible instruments and devices. It has been used by a variety of musicians, including jazz pianist Herbie Hancock and classical pianist Lang Lang. The PS-35S is a great choice for those looking for a full-size digital piano with a range of features.