Music will soon be sold and delivered over the telephone. Deutsche TeleKom (DT) is to offer a dial upaudio-on-demand service in Germany later this year, allowing customers to compile their own music collection. DT will offer the ,,service by digitising music and compressing it to a twelfth of itsoriginal size so that it can be transmitted efficiently by telephone lines. Customers will be able to dial up individual tracks, receive them over the telephone through a modem and save them on computer hard disks.