Singer Adam Levine of Maroon 5 performs on NBC's "Today"...

Singer Adam Levine of Maroon 5 performs on NBC's "Today" at Rockefeller Plaza in Manhattan. (Aug. 5, 2011) Credit: Getty Images

STREAMING CONCERTS Maroon 5 performs an online set for "Live on Letterman" after taping a CBS "Late Show" appearance. The group hits the Web Tuesday at 8 p.m. Also this week: punk rock quartet The Gaslight Anthem, Wednesday at 9 p.m. Watch at cbs.com/liveonletterman.

MORE MUSIC Download fresh sounds from this summer's Adult Swim Singles Program. A never-released track is posted for free download every Monday over the next 12 weeks. Up now: Unknown Mortal Orchestra. Posting Monday: The Hives. Grab 'em at adultswim.com/singles.

TV'S SPIDER-MAN Wednesday starts Peter Parker week at Manhattan's Paley Center for Media. Superhero screenings feature two animated faves, "Spider-Man" (1967-70) and "Spider-Man & His Amazing Friends" (1981-83), plus Disney XD's new "Ultimate Spider-Man." Three episodes daily at 3 p.m. are free with Paley Center admission. Also screening: remastered "Doctor Who" classics on the last Saturday of each month at 1 p.m. (It's Peter Davison in "Resurrection of the Daleks" next Saturday.) Info at paleycenter.org/events.

UPRIGHT COMEDY Amy Poehler and other founders of Upright Citizens Brigade host their annual improv marathon Friday through next Monday. Included: 150 live shows around the clock around the city (with more around the country). Listen at SiriusXM's UCB Radio (free trial at siriusxm.com/comedytrial). Or attend performances detailed at delclosemarathon.com.

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