Here's a demo song of two ultra-light portable 61-key digital pianos, based on Elton John's classic track "Song for Guy".
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The drum and percussion sounds, as well as the bass, come from Apple's GarageBand. The digital pianos each supply the following sounds:
– Grand Piano
– DX Electric Piano
– Strings
– Drawbar Organ 
… and there's a sprinkle of vibraphone (Yamaha NP-15) in the fade-out.
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• Casio CT-S1
https://www.f-musiikki.fi/casiotone-ct-s1-bk-kosketinsoitin-cts1bk.html
• Yamaha NP-15
https://www.f-musiikki.fi/np-15-b-digitaalipiano-musta-np15b.html

Casio CT-S1 + Yamaha NP-15 – demo song – pianos only

Martin Berka 1