For the short time they were together I would rate Buffalo Springfield right up there with the Yardbirds. They had a huge influence in starting the country rock movement that came later with CSN&Y, The Eagles, The Byrds and Poco. But for bluesrock, it would be hard to beat the bands that started it all like The Yardbirds and John Mayall & The Bluesbreakers. A band that started the careers of Eric Clapton, Mick Taylor and Peter Green.