London - Viagogo, the operator of an online secondary ticket exchange in Europe, announced that it has raised $15 million in its fourth round of funding, from investors including tennis stars Andre Agassi and Steffi Graf, and return backer Index Ventures.

London - Artist management firms representing more than 400 performing artists, including Radiohead, Arctic Monkeys and KT Tunstall, have joined together to try to secure artists a share of secondary online concert ticket sales. The Resale Rights Society (RRS) is targeting companies such as eBay, Viagogo and Seat Exchange, which generate an estimated more than $400 million annually in secondary ticket sales in the U.K.

London - Viagogo, a U.K.-based online ticket reseller, has raised $30 million in its third round of funding, from investors including Index Ventures, LVMH chairman Bernard Arault, German media mogul Herbert Kloiber, and international financier Jacob Rothschild.

London - Major record label Warner Music Group announced that it has signed a deal with online ticket reseller Viagogo, providing fans who purchase tickets resold through the service with free downloads, ringtones and videos, Reuters reported.