Labels trade group the Recording Industry Assn. of Japan (RIAJ) today (Sept. 20) introduced a monthly master-ringtone chart as well as gold and platinum certifications for master ringtones and full-so

Labels trade group the Recording Industry Assn. of Japan (RIAJ) today (Sept. 20) introduced a monthly master-ringtone chart as well as gold and platinum certifications for master ringtones and full-song downloads.

The RIAJ’s ranking and certification system is the first in Japan based on data directly provided by record labels, specifically the association’s 42 member companies. The data is based on each label's cumulative sales figures from all the mobile and Internet service providers to which they license content, including Japan's iTunes.

No. 1 on the RIAJ's inaugural August's master ringtone chart was "Yumekui (Dream-eater)" by female vocalist Ai Otsuka (Avex). It was followed by "I'll Be There" by Kumi Koda, another female singer signed to Avex, while at No. 3 was "Rupin the Fire" (BMG Japan) by male vocalist Seamo.

The September chart is scheduled to be unveiled around the same time next month.

Topping the RIAJ's list of gold and platinum certifications was novelty hit song "Koi no Maiahi - Dragostea Din Tei" by Romania-based Moldovan trio O-Zone (Avex), which racked up more than 4 million master ringtone sales between Sept. 22, 2004 release and Aug. 31, 2006.

For master ringtones, the RIAJ award platinum certification for sales of more than 250,000 units; double platinum for sales of more than 500,000 units and triple platinum for sales of more than 750,000 units

For full-song downloads, gold certification is awarded for sales of more than 100,000 units; platinum is credited for sales of more than 250,000 units and double platinum is for sales of more than 500,000 units.

A total of 16 tracks made it into the RIAJ's platinum full-song downloads category. And a combined 53 tracks made it into the gold category.

The RIAJ says it may introduce a monthly chart for full-song downloads in the future.