I Quattro are a Swiss quartet of tenors, comprised of Simon Jäger-Vogel (who hails from Küngoldingen), Damian Meier (Solothurn), Matthias Aeberhard (Güttingen), and Roger Widmer (Zürcher Oberland). They made their Top Ten hit album debut in 2009 with Passione on Universal Music. Produced by Jean-Marie Fontana and comprised of Swiss evergreens along with a couple surprises (e.g., Gotthard's "Heaven," Roy Orbison's "Blue Bayou"), Passione reached number seven on the Swiss albums chart. ~ Jason Birchmeier