I would suggest along with the sites listed in the other string where to post like Facebook, Myspace, etc... just don`t limit it to these sites only, try to spread the word on music sites, get gmail alerts on Yanni reply to blogs on gmail alerts that talk about Yanni and the Voices, radio stations, etc..
Just want to mention that Street Team work doesn't only have to be on the computer.
Everyone that knows me knows I'm a Yanni fan. In my work area on my job I have a poster I hand carried from Mexico announcing the Voices at Mundo Imperial and a Yanni Voices Live in Concert Tour 2009 poster. A few years ago I was in a car accident. I had a Yanni calendar and a picture of Yanni and me at my desk. A co-worker took an 11 X14 piece of paper and scattered the pictures from each month and the one of Yanni and me on the paper. Then she had everyone in the office sign it as a get well card. I had it laminated and it's also up on my wall. People are always asking me what Yanni is doing now and when I am going to another concert.