Question: The rock band joined by Tru Collins in 2010 has sold approx. how many concert tickets?
Sentence (from "Trans-Siberian Orchestra"): 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.
Relevant evidence: No