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

. >> reporter:ow he calls these natural symphonies biophonies and they have the distinct pattern of orchestrasith te animals singing harmoniously while each be heard while sending messages. bernie hopes his book the great an man orchestra due out next year will help all of us want to slow down, tune in, and enjoy the symphony of life. >> the natural world is providing a gift to us. this gift is free. and everybody has access to it. and the more that you do, it it's going to change your life. and it just takes listening and being quiet. >> reporter: doug mcconnell, nbc bay area news. >> i'm going to listen a little more next time on my hike. >>> jazz was in the air in san jose today and people were listening. ♪ and tens of thousands of people came out to hear it. today was the third day of an show zai's annual jazz festival. just like jazz musicians play many songs. the nonprofit san jose jazz organization has hosted the festival for the past 25 years. and rob meiette at that, it was a beautiful day to listen to anything. >> the weather has to be nice for both. all around the bay area, pretty n

symphony. those who played it were an orchestra formed more than a decade ago to promote a shared language between nations. this concert has to have scored pretty highly. >> we can share the important message of peace, that we are all one, through music. i will never forget it. >> headlines in the papers here talk about music's healing power. this concert has generated attention at a time when links between north and south korea have shriveled. the audience, all south korean, read their own political messages into it. >> peaceful unification is our wish. i am thankful through the expression of this through music rather than words. >> the conductor said he was not doing this to win the favor of the general public, like politicians do. he said he did not have the power to bring peace or solve conflict, but music can create dialogue. >> when i am sure the musical experience, sometimes it makes dialogue a little bit easier. >> cents the founding of the orchestra in 1999, it has played to audiences all over the world, including the gaza strip. the concert marks the end of the orchestra's first north as

. >> reporter: he calls the national symphonies biophonies and have patterns of human orchestras and choruses with animals singing harmoniously so each can be heard, communicating important messages for their survival. coincidentally, providing musical entertainment and education to people living close to nature. >> these groups of people use, still use, the natural soundscape as a karoke orchestra. in our hectic, noisy, urban world removed from wildlife many of us never hear nature's musical voice. ernie hopes his book, the great animal orchestra due out next year will encourage all of us to visit our parks, protected lands. slow down, tune in and enjoy the symphony of life. >> the natural world is providing a gift to us. this gift is free. and everybody has access to it. and the more that you do it is going to change your life and it just takes listening and being quiet. >> reporter: doug mcconnell, nbc, bay area news. >> nice. i like that. the acoustic turf. >> beautiful. >> still ahead tonight at 6:00 -- the casey anthony saga take is a new turn. why she is now being forced to re