A cappella (Italian for In the manner of the church) music is group vocal music or singing without instrumentalaccompaniment, or a piece intended to be performed in this way. A cappella was originally intended to differentiate between Renaissancepolyphony and Baroqueconcertato style. In the 19th century a renewed interest in Renaissance polyphony coupled with an ignorance of the fact that vocal parts were often doubled by instrumentalists led to the term coming to mean unaccompanied vocal music. In modern usage, a cappella often refers to an all-vocal group performance of any style, including barbershop, doo wop, and modern pop/rock. Today, a cappella also includes sample/loop "vocal only" productions by producers like Jimmy Spice Curry, Teddy Riley, Wyclef, and others. It is also a well known fact that in order to be considered a true a capella group, the group's name must be a pun, or play on words (e.g. the Penn Chants from University of Pennsylvania, the CunninLynguists, the Logarhythms from the Massachusetts Institute of Technology, Cheltenham High School's Up the Octave and Sons of Pitch, and the lesser known I'm on a Note, to name a few).