Categories: Music stubs | Musical groups A piano trio is a group of piano and two other instruments, almost always a violin and a cello, or a piece of music written for such a group. ... A string trio is a group of three string instruments or a piece written for such a group. ... A clarinet-violin-piano trio is a chamber musical ensemble made up of one clarinet, one violin, and one piano, or the name of a piece written for such a group. ... The power trio is a rock and roll band format popularized in the 1960s (see 1960s in music). ... Wikibooks has a manual, textbook or guide to this subject: Harmonica A harmonica is a free reed musical wind instrument (also known, among other things, as a mouth organ or mouth harp, French harp, tin sandwich, blues harp, simply harp, or Mississippi saxophone), having multiple, variably-tuned brass or bronze... Ternary form is a structuring mechanism of a piece of music. ... The Stars and Stripes Forever by John Philip Sousa is considered amongst the greatest marches ever written. ...