The Resale Rights Society (RSS), the live music lobbying organization, has hit out at the "mounting chaos" over ticketing for Madonna's stadium shows in the U.K.

Madonna became one of the first major artists to engage with the secondary ticket industry when it was announced she was partnering with the U.K.-based Viagogo. The company was last month confirmed to be the official premium ticket seller as well as the secondary ticketing partner for the "Sweet and Sticky" tour in Europe.

The RSS says the ticketing for the Wembley Stadium and Cardiff Millennium Stadium concerts show the need for regulation of the secondary ticketing market. The organization cites the availability of 3,361 tickets for Wembley on Sept. 11 on rival secondary sites, including Seatwave, eBay and GetMeIn, as proof that Viagogo's official status is "effectively meaningless".

Consumers can get the best value deals on some seats from Viagogo, the RSS admits; the official premium ticket partner advertises gold circle "Hot Ticket" packages in Cardiff on Aug. 23 for £238 ($467). The rival firm Seatwave is selling secondary gold circle tickets for up to £335 ($658).

However, Viagogo has secondary general admission Wembley standing tickets priced up to £250 ($491), while the official primary ticket agency Ticketmaster is selling them for £75 ($147).

"This sorry mess shows that even an artist as powerful as Madonna is not able to control the chaos in the ticketing market," says RSS chairman designate Marc Marot.

"Viagogo cannot have it both ways. They are either an official legitimate partner of the artist or they are attempting to take fans for whatever they can get. If they are an official part of the Madonna tour they should not be selling tickets in the secondary market when primary tickets are available for less than half the price from Ticketmaster."

Marot adds "The live music industry risks sleep-walking into disaster if this kind of abuse of fans' goodwill is not resolved. There is a very real danger that music fans will simply walk away if there is not some kind of regulation of the market.

"RRS is the best solution on the table and we call upon all artists, especially superstars like Madonna, and promoters to stand together to support what is clearly the most fan- and artist-friendly solution."

The RRS was launched in December in an effort to ensure some of the proceeds of secondary ticketing go back to artists.

In a statement, Eric Baker, CEO Viagogo, responds: "This RRS announcement highlights their own redundancy. Madonna will receive a percentage from the tickets resold without adding the fan tax. Presumably Marc Marot is unhappy as he will not have the opportunity to take a cut of this percentage for his society.

"We've always worked for the fan but now we're finding solutions across the board for the artist and the industry. The Madonna Viagogo partnership is a perfect example of how the secondary ticketing industry and the music industry can work well together, exactly as was encouraged by the recent U.K. government report."