Silverchair [ tickets ] has pushed back until Thursday (7/19) the launch of its US tour, and has rescheduled four California shows that were to serve as the trek's initial dates.

The band's originally planned July 13 show at the House of Blues in Anaheim, CA, has been rescheduled for Nov. 14; the gig at House of Blues in San Diego has been pushed to Nov. 16; the appearance at The Independent in San Francisco is now set for for Nov. 18; and at the show at The Wiltern in Los Angeles for Nov. 20, according to a spokesperson. Tickets for the original performances will be honored on the makeup dates; alternatively, refunds are available at the point of purchase. The tour is now expected to begin Thursday (7/19) in Portland, OR.

The rescheduled shows are the result of Silverchair frontman Daniel Johns's bout with a viral throat infection, according to a press release. Doctors have advised the singer to avoid singing for four to six days in order to avoid risking permanent damage to his voice.

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Rap mogul 50 Cent [ tickets ]--who back in May announced that he was pushing the release of his forthcoming album, "Curtis," from June 26 to the first week of September--has further delayed the set until Sept. 11. 50's label, Interscope Records, said in a press release that, because of the Labor Day holiday on Monday, Sept. 3, "the decision was made to push the release one week so that it is available everywhere at 10 a.m. on the day of release.

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"Johnny Cash [ tickets ] - The Great Lost Performance," an album that captures the late country legend's July 27, 1990 performance at the Paramount Theatre in Asbury Park, NJ--is due in stores July 24, according to Universal Music Enterprises. According to a press release from the label, the recording was "only recently unearthed and newly mixed from the original multi-tracks."

The nearly hour-long disc houses 18 songs, including "I Walk the Line," "Hey Porter," "Folsom Prison Blues," "Ring of Fire" and "(Ghost) Riders in the Sky," as well as a duet with his wife, the late June Carter Cash. The collection also features Cash's first performance of "What Is Man?," and his only recorded version of country gospel's "Wonderful Time Up There" and "A Beautiful Life."

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System of a Down frontman Serj Tankian [ tickets ] currently is in the studio mixing his debut solo album, "Elect the Dead," which will surface on his Reprise Records imprint, Serjical Strike, this fall, according to a press release.

"There are political songs, funny songs, love songs, songs about painful experiences, vanity, and the environment," Tankian said in a prepared statement. "It has a deep melancholy that runs from the personal to the global, with a glimmer of hope in the solidarity of spirit."