I wondered why olga.net has been shut down....maybe below written is the reason:
( something I found in on another forum ) What do you think about this development? I personally understood the napster case, but music tablature????? Hell, it felt like heaven and brought my playing forward...

"The Internet put the music industry and many of its listeners at odds, thanks to the popularity of services like Napster and Grokster. Now the industry is squaring off against a surprising new opponent: musicians.

In the last few months, trade groups representing music publishers have used the threat of copyright lawsuits to shut down guitar tablature sites, where users exchange tips on how to play songs like "Knockin' on Heaven's Door," "Highway to Hell" and thousands of others.

The battle shares many similarities with the war between Napster and the music-recording industry, but this time it involves free sites like Olga, GuitarTabs.com and MyGuitarTabs.com, and even discussion boards on the Google Groups service like alt.guitar.tab and rec.music.makers.guitar.tablature, where amateur musicians trade "tabs"--music notation especially for guitar--for songs they have figured out or have copied from music books.

On the other side are music publishers like Sony/ATV, which holds the rights to the songs of John Mayer, and EMI, which publishes Christina Aguilera's music.

"People can get it for free on the Internet, and it's hurting the songwriters," said Lauren Keiser, who is president of the Music Publishers' Association and chief executive of Carl Fischer, a music publisher in New York."