The Piano Guys

The Piano Guys are an American musical group consisting of Jon Schmidt, Steven Sharp Nelson, Paul Anderson, Tel Stewart, and Al van der Beek. They gained popularity through YouTube, where they posted piano and cello renditions of popular songs and classical music. Schmidt and Nelson's music is accompanied by professional-quality videos shot and edited by Paul Anderson and Tel Stewart. In December 2011, they released their first album, titled Hits Volume 1. Their second album, The Piano Guys, reached number one on the Billboard New Age Albums and Classical Albums charts in 2012.

source: Wikipedia