Ensiklopedia Defenisi dan Pemahaman

ABA is a term of analysis to describe form of a piece of music, i.e. 1st section (A) followed by different section (B) followed by repeat of 1st section (A). Many permutations possible.

A is note of the scale (6th degree of natural scale of C). Hence Ab, Abb, Anat., A#, A##, A major, A minor, etc. A is note commonly used for tuning instrument (orchestras, tune to the ob. A). A = 440 vibrations per second, internationally accepted since 1939, although some orchestras still accept A = 435 and (in USA) A = 445.