how did the idea of a youtube symphony orchestra come about? ething we're excited about. it came from within youtube. we thought an the idea of assembling the world's biggest online collaborative orchestra and it grew from there. >> reporter: in order to audition, the musicians had to submit videos online. >> i was messing around on youtube looking at random videos and saw a link for the youtube symphony orchestra. it looked interesting. saw i had to make a five minute audition tape and decided it would be easy enough. >> reporter: judges sifted through 3,000 submissions from all over the world. they whittled the group down to 200 finalists. then the videos were posted on youtube where people could vote for their favorite. ♪ 90 winners from different ages and backgrounds for slekelectedd treated to an all expenses paid trip to new york city. >> they sent me an e-mail telling me i'd been accepted. i was so surprised. there were so many people auditioning from all over the world. >> reporter: the ambitious musical project is can do. in the beginni