Question: The rock band joined by Tru Collins in 2010 has sold approx. how many concert tickets?

Tru Collins is an American actress and indie-pop singer.  She is known for her role of Julie on MTV's original high school comedy, Awkward.  Tru was born in Richmond, Virginia to five-time Emmy Award winning television journalist Reid Collins and choreographer Lindy Fisher.  She attended Manhattan's Professional Performing Arts School at 15 while studying classical piano and training with Elaine Kudo of American Ballet Theatre.  Collins began college with a songwriting scholarship from Universal and studied at New York University and The New School in New York City.  In 2014, she guest starred on Showtime's period drama Masters of Sex opposite Michael Sheen and had a supporting role in Spring Awakening, an indie film set in the late 1800s.  In 2010, she joined Atlantic Records' multi-platinum progressive rock band Trans-Siberian Orchestra as a vocalist, touring arenas across North America and promoting the band performing acoustic guitar/vocal solos live on numerous rock radio stations.  Tru has recurred as mean girl Julie on MTV's Awkward seasons 2 - 5.  As a singer, she performed with Grammy-winning soul singer Latrice Varrett, opening for Aretha Franklin at the Nokia Theatre Times Square in 2009.  That year, TSO reached #12 on the Billboard charts for American Arena Tours, beating Taylor Swift and Justin Bieber.  The tour grossed $47,395,108 and sold out 51 arenas.  She has co-written songs with Rostrum Records artist Vali and Three 6 Mafia's Juicy J, and her work has been featured on various recordings and television soundtracks.  In 2012, Collins performed with DJ Ravi Drums, Kitara player Craig Dobbin, and rapper Wes Period at the Air Canada Centre Arena in Toronto.  In 2015, Tru joined Steven Seagal's blues band Thunderbox for a European tour and performed with ten-time Grammy Award winner George Benson at the Cognac Blues Passion Festival in Cognac, France.  Her debut solo EP, "Story of A Gypsy Child", from producer Jonny on the Rocks of Brooklyn bands Shinobi Ninja and Rocky Business, is set for 2015 release.  Her music video for the first single, "Party Dress", was released via YouTube in February 2015. <SEP> The Warp Riders Tour is a 2010–2011 worldwide concert tour by American heavy metal band The Sword.  Beginning on October 1, 2010 in the United States, the tour is in promotion of the band's upcoming 2010 third album "Warp Riders", released on August 24, 2010.  Following the United States leg of the tour, the band joined Soundwave, a travelling music festival, in Australia in 2011.  They will then perform an additional 12 shows in Europe.  Prior to the tour, the band supported Metallica on their continuing World Magnetic Tour in September, and during the tour they also performed at the Austin City Limits Festival, between October 8 and October 10. <SEP> Trans-Siberian Orchestra (TSO) is an American progressive rock band founded around 1993 by producer, composer, and lyricist Paul O'Neill, who brought together Jon Oliva and Al Pitrelli (both members of Savatage) and keyboardist and co-producer Robert Kinkel to form the core of the creative team.  The band gained in popularity when they began touring in 1999 after completing their second album, "The Christmas Attic" the year previous.  In 2007, the "Washington Post" referred to them as "an arena-rock juggernaut" and described their music as "Pink Floyd meets Yes and The Who at Radio City Music Hall."  The band has released a series of rock operas: "Christmas Eve and Other Stories", "The Christmas Attic", "Beethoven's Last Night", "The Lost Christmas Eve", their two-disc "Night Castle" and "Letters From the Labyrinth".  Trans-Siberian Orchestra is also known for their extensive charity work and elaborate concerts, which include a string section, a light show, lasers, "enough pyro to be seen from the International Space Station", moving trusses, video screens, and effects synchronized to music.  TSO has sold more than 10 million concert tickets and over 10 million albums. <SEP> The Last Waltz was a concert by the Canadian-American rock group The Band, held on American Thanksgiving Day, November 25, 1976, at Winterland Ballroom in San Francisco.  "The Last Waltz" was advertised as The Band's "farewell concert appearance", and the concert saw The Band joined by more than a dozen special guests, including Eric Clapton, Ringo Starr, Bob Dylan, Ronnie Wood, Muddy Waters, Neil Young, Neil Diamond, Van Morrison, Bobby Charles, Dr. John, Paul Butterfield, Emmylou Harris,