Pop rock band Plain White T’s have announced plans for a second leg of North American tour dates on their Three Part Harmony Tour. A total of 18 new gigs have been added for the summer, beginning with a June 12 concert at Newport Music Hall in Columbus, OH, and ending July 2 at Varsity Theatre in Baton Rouge, LA.

Highlights of the three-week tour include a June 14 concert at Theatre of the Living Arts in Philadelphia, PA, a June 15 show at the Fillmore at Irving Plaza in New York, NY, a June 21 performance at the Cannery Ballroom in Nashville, TN, and a June 28 gig at The Social in Orlando, FL.

Chicago-based rock band Company of Thieves and pop-rock quartet Days Difference will round out the lineup for the next leg of the Three Part Harmony Tour. Ticketing details will be announced within the coming weeks on the band’s official Web site.

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Like the first round of tour dates in early spring, each concert will be a “show in three acts.” Plain White T’s performances will be broken down into three sets comprising their earlier rock songs, newer acoustic material and a final set of fan favorites.

Plain White T’s are continuing to support their fifth studio album, “Big Bad World,” released in September 2008. The disc, a quick follow-up to the previous year’s offering “Every Second Counts,” peaked at No. 33 on the Billboard 200, despite receiving mostly negative critical reviews.

Later this summer, the Plain White T’s will return to the road to support Jason Mraz on at least one date of his upcoming trek: July 27 at Verizon Wireless Amphitheater in Alpharetta, GA. The band also supported Mraz on a handful of dates during a brief spring jaunt.

Plain White T’s itinerary:
(Dates are subject to change.)

June 12 Columbus, OH Newport Music Hall
June 13 Pittsburgh, PA Mr. Small’s Theatre
June 14 Philadelphia, PA Theatre Of The Living Arts
June 15 New York, NY Fillmore New York At Irving Plaza
June 16 Baltimore, MD Rams Head Live!
June 17 Baltimore, MD Sonar
June 18 Raleigh, NC Lincoln Theatre
June 19 Birmingham, AL City Stages
June 20 Charlotte, NC Fillmore Charlotte
June 21 Nashville, TN Cannery Ballroom
June 23 Ft. Lauderdale, FL Culture Room
June 24 St. Petersburg, FL Jannus Landing
June 26 Calgary, AB Park 96
June 28 Orlando, FL The Social
June 29 Jacksonville, FL Freebird Live
June 30 Gainesville, FL The Venue
July 1 Mobile, AL Alabama Music Box
July 2 Baton Rouge, LA Varsity Theatre
July 27 Alpharetta, GA Verizon Wireless Amphitheater *

* with Jason Mraz