Ultimate-Guitar

Ultimate Guitar hosts a catalog of more than 1 million songs with free chords, guitar tabs, bass tabs, ukulele chords, and Guitar Pro and power tabs, a tab search engine, guitar lessons, gear reviews, rock news and community forums for discussion among guitarists, with an archive of over 2 million tabs covering songs across genres and every skill level.

It sells medium rectangle ads priced per impression through auction, in US dollars. Its ads.txt lists 115 ad system lines, 47 direct and 97 through resellers, with sales house M.D. Primis Technologies.