The group is trying to develop standards for portable digital music devices.

In the last year, several major new players have entered the market for portable music devices, including Dell.

"But I think that it's going to take a couple of years to really become a full-featured portable music device."

Madplayer was a portable music device that started selling in 2002.

The average music device, the survey found, is loaded with just 375 songs.

I am just not excited about getting radio on a portable music device.

The exterior of the phone shows it's a music device with its playback controls.

How much do we know about the effect of the constant use of portable music devices on hearing, particularly in young people?

Personal music devices have allowed the wedding party to further control the night's music if costs dictate.

The iPod has become the iconic portable music device of the century.