The G-clef (GC) piano/harp/accordion (GCP/GCH/GCA) is a variant of piano/harp/accordion notation in which the left hand (LH) staff uses instead of a standard F-clef (FC), an alternative G-clef (GC), GC 8vb (GC8vb) (aka GC in ”ottava bassa”) or 15mb (GC15mb) (aka GC in ”quindicesima bassa”) which means that LH notes should be played in GC but one or two octaves lower (8vb or 15mb) than written. GCP/GCH/GCA offers a much easier way to learn piano, because GC8vb and GC15mb are both much easier to learn and read than FC in any pedagogical system which initially uses GC to teach all the basic concepts of Western musical notation system. The main article dedicated to GCP/GCH/GCA and GC-based grand staff (GCGS) (together with other GC-based instruments [GCI]) can be accessed here: URL1, URL2, URL3-latest version. • Author's main site: www.dragoii.com; • See also the web page dedicated to all proposed G-clef instruments: www.dragoii.com/gci and www.dragoii.com/gcp • For a full catalog of my music (including non-self music arrangements) see URLs: URL1, URL2 and URL3 (latest version)