"Everything out of her mouth was sounding good! Who are we to give Christina Aguilera vocal advice?" the duo's Chad Vaccarino says of the recording session.
On Tuesday night's episode of "The Voice," Christina Aguilera performed a duet with A Great Big World's Ian Axel, a songwriter with a buttoned-up plaid shirt, frizzy hair and an ethereal voice that sounds like it might snap in half at any moment. The performance of A Great Big World's single "Say Something" was understated -- just a piano, some strings and a keyboard for instrumentation, and with Aguilera reining in her voice's natural power -- and exactly what Axel's duo with Chad Vaccarino needed to break their ballad, which has sold 52,000 downloads through last Sunday according to Nielsen SoundScan, to a much wider audience.
A Great Big World not only snagged Aguilera to assist on the reality show performance, but the pop superstar recorded a new version of "Say Something" with the group for its debut album "Is There Anybody Out There?," due out on Jan. 14, earlier this fall. Aguilera called the "Voice" performance "wonderful" on Twitter, and the recorded version of A Great Big World's "Say Something" featuring Aguilera (released to digital retailers, conveniently, on Nov. 4) quickly shot into the upper reaches of the iTunes Songs list, making it to No. 2, behind Eminem's new hit "The Monster."