Most instruments used in a piece of music

The most instruments used in a piece of music was 315 and was achieved by Rupam Sarmah (India) and his team, performing a symphony composed and directed by Rupam Sarmah at Jorhat Sports Complex, Assam, India, on 24 February 2013. The number of different instruments used was 315, however the total number of instruments used (including duplications) was 370, plus 106 vocalists, making a grand total of 476 musicians who performed the symphony which lasted for just over half an hour.