Less than two months after launching the Streaming Songs chart, which blends data from a variety of streaming services into one ranking, Billboard today unveils seven genre-specific charts utilizing the same methodology.

Rankings for country, R&B/hip-hop, rap, R&B, rock, Latin and dance/electronic will serve as 25-position distillations of the pan-genre Streaming Songs chart and appear weekly on both billboard.com (15 positions-deep) and on billboard.com/biz (in full).

The data which fuels the Streaming Songs chart, and the new genre rankings, combines with download sales and radio airplay totals to inform the Billboard Hot 100, Hot Country Songs, Hot R&B/Hip-Hop Songs, Rap Songs, R&B Songs, Hot Rock Songs, Hot Latin Songs and Dance/Electronic Songs charts.

Services measured by Nielsen Entertainment and contributing to the host of streaming charts are YouTube (including Vevo on YouTube), Spotify, Muve Music, Slacker, Rhapsody, Rdio, MySpace, Xbox Music and Guvera.  Rankings are based on plays, with on-demand and tethered plays counting twice as much as non-interactive radio streaming plays.

Leaders among the new charts this week include Darius Rucker’s “Wagon Wheel,” which tops Country Streaming Songs; Macklemore & Ryan Lewis’ “Thrift Shop” (featuring Wanz), which leads both R&B/Hip-Hop Streaming Songs and Rap Streaming Songs; and Justin Timberlake’s “Suit & Tie” (featuring Jay-Z), which hangs atop R&B Streaming Songs. Imagine Dragons’ Radioactive” tops the inaugural Rock Streaming Songs chart, while the nearly-three-year-old track from new “Voice” judge Shakira, “Waka Waka (Esto Es Africa),” leads Latin Streaming Songs. Overall Streaming Songs leader “Harlem Shake” by Baauer stands at No. 1 on Dance/Electronic Streaming Songs.

The changes are the latest in Billboard’s evolution of charting streaming activity. A year ago, the On-Demand Songs chart launched. The survey measures on-demand audio plays from leading subscription services. [Billboard]