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Billboard has added to its vast chart menu with the introduction of new digital download lists ranking the top songs in 21 specific genres, compiled from data gathered by Nielsen SoundScan.

All digital genre song charts appear in full to subscribers on billboard.biz, where Billboard's entire menu of charts is refreshed every Thursday. The charts will also be represented in Billboard magazine, with each issue featuring six 15-position digests of the surveys, with rock, country, R&B/hip-hop and Latin running every week, accompanied by a rotating selection of two others.

How are the new lists compiled? As with Billboard's album rankings, the Billboard charts department reviews hundreds of titles each week, assigning an appropriate genre or genres, or confirming a label's requested classification, to each entry.

"Billboard is always thrilled to launch songs charts that reflect evolving consumer purchasing tastes," says Billboard director of charts Silvio Pietroluongo.

"The digital genre rankings are a great way to drill down beyond the overall top-selling download titles to see which songs and artists are the hottest in a multitude of specific genres."

The overall Digital Songs chart continues on billboard.com, billboard.biz and in print as the premier chart of record for all-format download sales. The list's data began contributing to the Billboard Hot 100 in February 2005.

Here is a rundown of the No. 1 titles on each of Billboard's digital genre song charts dated April 10. While many genres are led by current titles, certain more niched formats, which aren't often driven by hit singles, sport older, more widely-known songs at the summit. On New Age, for example, Enya reigns with the almost-10-year-old "Only Time," while B.B. King tops the Blues tally with "The Thrill Is Gone," a No. 15 hit on the Hot 100 in 1970.

Rock "Hey, Soul Sister" Train

Country "Need You Now" Lady Antebellum

R&B/Hip-Hop "Rude Boy" Rihanna
Rap "Nothin' On You" B.o.B featuring Bruno Mars

Latin "I Know You Want Me (Calle Ocho)" Pitbull
Regional Mexican "Ando Bien Pedo" Band Los Recoditos
Latin Pop "I Know You Want Me (Calle Ocho)" Pitbull
Tropical "Dile Al Amor" Aventura
Latin Rhythm "I Know You Want Me (Calle Ocho)" Pitbull

Classical "You Raise Me Up" Josh Groban

Christian "Live Like We're Dying" Kris Allen
Gospel "The Best in Me" Marvin Sapp
Christian/Gospel "Live Like We're Dying" Kris Allen

Jazz "Haven't Met You Yet" Michael Buble

Dance/Electronic "Telephone" Lady Gaga featuring Beyonce

Blues "The Thrill Is Gone" B.B. King

Comedy "I'm on a Boat" the Lonely Island featuring T-Pain

Kid "Hero" Christopher Wilde

New Age "Only Time" Enya

Reggae "Hold You (Hold Yuh)" Gyptian

World "Somewhere Over the Rainbow"/"What a Wonderful World" Israel "IZ" Kamakawiwo'Ole