Entrepreneurs Deborah Meaden and Theo Paphitis both invested in the Mixalbum.com concept that mixes downloaded tracks.

Sony BMG, EMI and Ministry of Sound are among some of the record companies signed up for launch of the service, which also includes features such as speed change and auto-arrange - so tracks can increase in speed through the mix.

Founder Ian Chamings says,: "I think that some people have been put off buying dance singles for this reason - DJs can mix ...