With tickets to her first tour in five years moving quickly, Britney Spears [ tickets ] keeps adding more shows to the mix.

On-sales get underway Saturday (12/20) for upcoming appearances in Columbus, OH; and Uncasville, CT.

[Click to search for Britney Spears tickets at Ticketmaster.com.]

Lil Wayne's winter tour is underway, and the star rapper is scheduled to remain on the North American arena circuit through most of January.

Saturday (12/20) on-sales are planned for Columbus and Cincinnati, OH, as well as Minneapolis.

[Click to search for Lil Wayne tickets at Ticketmaster.com.]

Disturbed [ tickets ] recently put the wraps on their 2008 tour, but the nu-metal rockers are already making plans for their next outing to support their latest album, "Indestructible."

Tickets hit the market Friday (12/19) for the tour's stops in Los Angeles; Utica, NY; and Huntington, WV. On-sales begin Saturday (12/20) in Sacramento, CA; Augusta, GA; Dayton, OH; Atlantic City, NJ; Pompano Beach, FL; Las Vegas; and Scranton, PA.

[Click to search for Disturbed tickets at Ticketmaster.com.]

Irish vocal group Celtic Woman [ tickets ] has unfurled a long list of US dates for 2009, with concerts spread across most of the first half of the coming year.

Tickets hit the market Friday (12/19) in San Jose, CA; and Gainesville, FL.

[Click to search for Celtic Woman tickets at Ticketmaster.com.]

The Pretenders [ tickets ] will hit the road running in 2009, with the veteran crew pushing hard behind its first new album in six years, October's "Break Up the Concrete."

Tickets hit the market Friday (12/19) for the tour's Cleveland, OH, stop, and Sunday (12/21) on-sales are set for San Francisco.

[Click to search for Pretenders tickets at Ticketmaster.com.]

Ticket on-sale information for many other artists--including Ryan Adams [ tickets ], John Legend [ tickets ], Vince Gill [ tickets ] and The Black Keys [ tickets ]--is available at LiveDaily's Ticket Report.

Unless otherwise noted, tickets are available from Ticketmaster and Ticketmaster.com, as well as the venue box office. On-sale dates and/or times are subject to change. Ticketmaster is LiveDaily's parent company.