On March 9, John Mayer announced that he is being forced to cancel his upcoming 2012 Spring Tour in order to receive treatment for a returning granuloma, which is a growth that occurs in the throat and is exacerbated by the vocal cords making repeated contact.

Mayer was initially diagnosed with the condition last fall, with doctors placing him on extensive vocal rest at the time. This led to a nixed appearance at September 2011's iHeartRadio Music Festival in Las Vegas and another with Tony Bennett in Los Angeles.

Tickets for upcoming concerts from John Mayer, as well as tickets for the upcoming tour from Rihanna, are on sale throughout the weekend ending April 19 as compiled by TicketNews.

Kicking off this weekend’s onsales are tickets to Rihanna’s summer tour. Touring alongside current star Ke$ha, stops on sale this weekend include Las Vegas, San Antonio, and Phoenix. Also on sale throughout the weekend are tickets to upcoming concerts from superstar singer/songwriter Lady GaGa. The always intriguing pop star, who is currently riding the smashing success of her first album, has shows in Dallas, Houston, and Edmonton among the onsales.

Tickets for several upcoming concerts from John Mayer as well as tickets for upcoming NCAA basketball games are on sale throughout the weekend ending November 30 as compiled by TicketNews.

This weekend's onsales are less busy than past weeks in light of the Thanksgiving holiday, but there are still several concerts, theater, and sporting event ticket onsales to take note of.

Singer-guitarist John Mayer will use paperless tickets for premium seats for some shows on his upcoming arena tour, the popular songwriter announced this week in an email to fans who have signed up for his fan club.

Mayer is the latest artist to use the system, following the likes of Miley Cyrus and Bruce Springsteen, but how it will be received by fans is unknown. While some venues have reported no problems with the paperless system, many fans and ticket brokers have taken to the Internet to complain about the lack of transferability of paperless tickets, and the delays in entering arenas.

Ticket resale troubles for Garth Brooks and a last-minute cancellation from Bruce Springsteen's camp lead the daily tour recap for October 27, as compiled by TicketNews.

Twenty sold-out concerts were no problem for Garth Brooks, who begins his five-year residency at the Wynn Resort in Las Vegas this December. But fighting ticket scalpers has turned into a major process for the performer and casino CEO Steve Wynn. Today was the deadline for attendees to submit a full list of guests who will accompany them to Brooks' concerts. Those who missed the deadline, or don't show proper ID on the night of their event, run the risk of having their tickets cancelled. Read the full story here.