Bis is a Latin prefix or suffix designating the second instance of a thing, thus preceding ter. An example in recent modern usage is the ITU-T modem standard from the late 20th century, V.32bis. Bis can also refer to:
Pachelbel's Canon in D major, a piece of chamber music scored for three violins and basso continuo and originally paired with a gigue in the same key, experienced a tremendous surge in popularity during the 1970s.
Relative keys - major and minor. Relative keys have, as said above, the same notes and it can be found for all major and natural minor scales. G major is relative with E minor, F major is relative to D minor; see all relative keys below: Cb - Abm. Gb - Ebm.