A satellite radio service adds an all-Elvis all-the-time format. “Elvis Radio, one of more than 130 channels on Sirius, may be the first station to transform what is normally a short-lived publicity stunt into a full-time dial fixture. As such, the all-Elvis station is widely viewed as an early litmus test for the ultra-niching that may lie ahead in satellite and digital radio, which offers listeners hundreds of channel choices.”