on tracks 2 and 5, percussion on track 6 Brandon Bush – Hammond organ on tracks 1, 2, 3, 7, 9 and 14; Wurlitzer electric piano on tracks 1, 4 and 9; Rhodes piano on tracks 5 and 14; Mellotron on tracks 12 and 14 John Alagia – percussion on track 1, 2, 3, 4, 5, 8 and 9; guitar on tracks 5 and 9; Hammond organ on track 4 and 6; Wurlitzer electric piano on track 6; jingle bells on track 14; production; mixing on tracks 2, 5, 6, 11, 12 and 14; engineering Clay Cook – backing vocals on tracks 2, 5 and 9 Doug Derryberry – backing vocals on tracks 2, 5 and 9 Chris Fischer – congas on track 4 Carole Rabinowitz – cello on track 6 Jon Catchings – cello on track 6 Kristin Wilkinson – viola on track 6 David Angell – violin on track 6 David Davidson – violin on track 6 Jerry Marotta – drums on track 8 Production Jack Joseph Puig – mixing on tracks 1, 3, 4, 7, 8, 9 and 10 Jeff Juliano – mixing on tracks 2, 5, 6, 11, 12 and 14; engineering; Pro Tools engineering Scott Hull – mastering John Mark Painter – strings arrangements Greg Di Gesu – assistant engineer Dan Fallon – artwork Alex Fallon – artwork Joshua Kessler – photography (Columbia release) Charts Weekly charts Year-end charts Decade-end charts Certifications References External links Room for Squares at Discogs John Mayer albums 2001 debut albums Albums produced by John Alagía Columbia Records albums Aware Records albums