The term MUSIC DEVICE can be summarized by two crossword solutions: STEREO (6 letters) and IPOD (4 letters). A STEREO is an electronic device that produces sound from two or more independent audio channels, allowing for a more realistic sound experience. An iPod is a portable media player created by Apple Inc. that stores digital music and video files. It was first released in 2001 and has since become one of the most popular music devices in the world.