From Wikipedia:
MTV (originally an initialism of Music Television) is an American cable television channel and the flagship property of the MTV Entertainment Group, a sub-division of the Paramount Media Networks division of Paramount Skydance. Launched on August 1, 1981, the channel originally aired music videos and related music entertainment programming guided by television personalities known as video jockeys (VJs). MTV soon began establishing its presence overseas, eventually gaining an unprecedented cult following and becoming one of the major factors in cable programming's rise to fame, leading American corporations to dominate the television economy in the 1990s.
-----
120 Minutes: Can you believe people used to sit down and watch music videos for two hours? Nowadays people can't seem to sit still for a 20-second Tik Tok. 120 Minutes was an extremely influential alternative music program on MTV. Robyn served as guest host on two occasions. For more info, check out 120minutes.org, a nonprofit attempt to document the history, run by dedicated fans of the show.

From Wikipedia:
120 Minutes is a television program in the United States dedicated to the alternative music genre, that originally aired on MTV from 1986 to 2000, and then aired on MTV's associate channel MTV2 from 2001 to 2003.

After its cancellation, MTV2 premiered a replacement program called Subterranean. A similar but separate MTV Classic program, also titled 120 Minutes, plays many classic alternative videos that were regularly seen on 120 Minutes in its heyday.

120 Minutes returned as a monthly program on MTV2 on July 30, 2011, with Matt Pinfield as host.