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.
In the lesson about the major keys on the circle of 5ths you learned every key has a unique number of flats or sharps. The flats and sharps from key to key are not random . The flats and sharps of each key follow a specific, unchanging order that you need to memorize. This order is called the order of flats and the order of sharps.