Bj's academy of music has best guitar techers.Its in pitampura and the fees is also very economical. they have various packages...including free guitars and authorized certifiates.!! for more details ontat 9873902008
I know a guitar academy named Guitar Planet Delhi in sector 11 rohini run by Suchait, who himself is a great guitarist with the knowledge of rock, metal and blues. He's been playing since 20 years now and has performed in several concerts across India. He plays everything from Led zepplin, metallica pearl jam to latest numbers of bollywood as well. I had been taking classes from him and his techinks are amazing and quick. He made me play on my own within 5 months. Right from scales notes chords, to pentatonics, arpeggios, legato.. If anyone wants to reach him, I will post his contact details.