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.
Its relative major is G major, and its parallel major is E major. Much of the classical guitar repertoire is in E minor, as this is a very natural key for the instrument. In standard tuning (E A D G B E), four of the instrument's six open (unfretted) strings are part of the tonic chord. The key of E minor is also popular in heavy metal music, as its tonic is the lowest note on a standard-tuned guitar.