[[Trading 4s (or 8s, 2s)]]: A form of discontinuous drum solo in which 4 measure sections are alternately played solo by the drummer, and by the band with another soloist (who goes first). The latter can be one particular soloist throughout, or it can cycle through the different instruments. Also, two different instrumental soloists can trade 4s with each other, such as the trumpet and the sax. This is called a chase. Trading 4s usually goes on for one or two choruses