not. its 95% from search engines (60%google and 35% msn and yahoo) . The adsense ads match exactly what users are looking for, "if they search for "download free music" they get an ad "download free music"" thats why it has a big ctr. i have never bought adwords traffic, but maybe i will the site is in music niche. i have given before some tips for adsense optimization, etc... and i blogged about them, take a look at my personal blog (just at the side of my username)
like 2 hi ctr, i make this post to get subscribed cuz i cant understand shooot right now cuz im stoned ill read this one later. cyaa!aaaaaaaaa!!!
better be careful. if the impression is somewhat the same but the CTR is exceptional high from the usual google could assume some kind of weird thing going on.