Mashups Music reviewer Will Hermes tells us about a current fad among DJs, computer-savvy musicians and music artists. They're taking already recorded songs — some popular, some very obscure — and with the help of computer software, mixing them with new beats and sounds. The results are known as "mashups." (6:15) The music used in this piece came from http://www.base58.com. The software ACID can be found at http://www.sonicfoundry.com/products/home.asp.