The Piano Guys are seeking to bridge two worlds, 18th-century spiritualism and 21st-century secularism. In laymen's terms, they're attempting to imagine what would happen if Mozart and Adele collaborated on a piece of music. What would it sound like? How would that music evolve? They took Mozart's Lacrimosa and Adele's Hello and fused them together forming a brand new arrangement. The Piano Guys, who are playing Cellos here, found that while Mozart and Adele inhabit different times and countries, the emotional quality of their music is undeniably linked once again illustrating the universal nature of music. This new piece is affectionately referred to as Chello.