Opera--10:30 a.m: Live from New York, the Metropolitan Opera has been broadcasting its Saturday matinees since 1940 on radio. Now, these performances are on the Internet too. This week's offering is Beethoven's "Fidelio," an opera probably better known for its stirring overture than its arias or libretto. In any regard, "Fidelio" is one of those somewhat rare operatic dramas in which justice triumphs over evil in the end. It stars Karita Mattila, Hei-Kyung Hong and Ben Heppner, and is conducted by James Levine. http://www.kusc.org
Jazz--10 a.m.: Documentary filmmaker Ken Burns, who takes on huge subjects such as the Civil War and baseball, has made a 10-part, 19-hour series on jazz for PBS. He discusses the film at http://www.broadcast.com/music/interviews.html.
Alternative Country--10 a.m.: Trent Summar is no urban cowboy. His hard-edged songs come from a place where, as his Web site has it, the swimming pools are above ground and muscle cars rule. The first song on his new album is about a dirt-track racer who serenades his girlfriend by singing, "I'm going to paint your name in purple on the side of the door and drive around and around for you." This mini-concert, with his band called the New Row Mob is at http://www.broadcast.com/music/concerts.html.
Rock--Noon: Remy Zero, which recorded its first album last year, is a band that has become a favorite at local clubs. This pay-per-view Webcast concert costs $7.99 if you are using a speedy connection. Dial-up modem connections to it are free. http://www.hob.com/live/events
Glee Club--3 p.m.: These ensembles seem to belong to the days when raccoon coats were all the rage at college football games. But a solid group can sound fantastic. At this concert, the Miami University Men's Glee Club performs Gregorian chants, spirituals and contemporary songs. http://www.kennedy-center.org/programs/millennium
Classical--5 p.m.: The Eroica Trio has not always been a critics' favorite, but pianist Erika Nickrenz, violinist Adela Pena and cellist Sara Sant'Ambrogio are undeniably audience pleasers with their vibrant, flashy playing. This performance features works by Argentine, Brazilian and Spanish composers. http://chat.yahoo.com
Money--10 a.m.: If you've made a New Year's resolution to handle your finances better, this could be the chat for you. Author and columnist Jean Sherman Chatzky is known for her no-nonsense approach to personal finance that attacks small matters in preparation for making grander plans. AOL subscribers use keywords "AOL LIVE" to join the chat.
Rock--Noon: Anthrax is one of the veterans of the metal scene, having formed in 1984. This pay-per-view Webcast concert costs $7.99 if you are using a speedy connection. Dial-up modem connections to it are free. http://www.hob.com/live/events
Folk--3 p.m.: Two singer-songwriters--Eliot Bronson and Ina May Wool--perform at this live acoustic concert from the Kennedy Center in Washington, D.C. http://www.kennedy-center.org/programs/millennium
Rock--Noon: The hard-driving Relative Ash band from Chicago blasts out tunes based on its own lives and the loved ones it's lost. http://www.hob.com/live/events
Opera--10:30 a.m.: See Pick of the Week.
Country/Folk--Noon: The great Willie Nelson, who has mellowed since the days when he helped invent outlaw country, plays a concert recorded in October in Los Angeles. http://www.hob.com/live/events
Gospel--Noon: With a name like the Zion Harmonizers, there's no mistaking that this is a gospel group. This concert was recorded in New Orleans. http://www.hob.com/live/events
Blues--Noon: Keb' Mo' is a modern blues player who spent a long time being mentored by Papa John Creech, but in his own right has won a Grammy and was a two-time winner of the W.C. Handy Award for acoustic blues. http://chat.yahoo.com
Swing--3 p.m.: A group called Chaise Lounge plays a live concert of swing and lounge music with a bit of 1960s pop mixed in. http://www.kennedy-center.org/programs/millennium
R&B--4 p.m.: The singer named Sparkle attracted some notice a few years ago when she did a duet with R. Kelly. Her career didn't catch fire, but now she's back with a new album of songs that she mostly wrote herself. She chats about the new direction of her career. http://chat.yahoo.com
R&B--Noon: Eight years ago, a quartet of cute little girls from Houston took the stage on the TV show "Star Search" and charmed the audience by rapping. The group, Destiny's Child, has grown up and greatly changed. It's now a trio, and these women much prefer to sing than rap. http://chat.yahoo.com
Thrillers--3 p.m.: Suspense author Dean Koontz chats about his new novel, "The Corner of His Eye," which has been described as the most horrific yet spiritual of his thrillers. It mixes murder, redemption and, of course, a complex battle between good and evil. http://chat.yahoo.com