Madonna has invited Eugene Hutz, Gogol Bordello's self-styled "bandleader and agent provocateur", and Sergey Ryabtsev, the New York gypsy punk act's violinist, to perform with her at Live Earth tomorrow.

Their participation at the Wembley Stadium leg of the environmental-awareness Live Earth spectacular has consequently forced Gogol Bordello to cancel their presence at the T in the Park festival in Scotland.

"Due to timings of their performance at T in the Park, and recent events, it was not possible to do both in one day and, as a result, Gogol Bordello have had to cancel their set at T in the Park," a spokeswoman said in a statement.

She explained that the invitation from Madonna stems from an unrelated project Hutz is working on with the female pop star.

After Hutz and Ryabtsev play at Live Earth, they will join the rest of Gogol Bordello to perform at the Oxegen Festival in Ireland on July 8, followed by the Beautiful Days Festival (Aug. 17-19) in Devon, south England.

The band, whose new album "Super Taranta!" (Side One Dummy Records) will be released on July 10, will also perform at the Reading and Leeds Festivals on Aug. 24 and Aug. 25.

In addition to a host of North American and continental European gigs between July 8 and Nov. 29, there are plans for a dedicated U.K. tour later this year.