Jazzy Sabbath

First two Black Sabbath records: still so much to dig up in those seminal LPs.

- one of the aspects of their sound, that rapidly dwindled in the following records, but characterises the 1969-70 production of the band are the jazzy flavoured riffs, impros and openings that you can find in songs such as "rat salad", the middle section of "warning", some riffs in "fairies wear boots", drums, guitar solos and extended versions in the rare live bootleg recorded in Scotland in 1969. 

One of those jazzy chunks that always amazed me is the added queue to "behind the wall of sleep" that you can hear in early live performances and BBC session of the band.

https://www.youtube.com/watch?v=aic0EZmpyU8

(from 3:50 circa) 

Would have been great if the band added the same impro queue also in the studio version... On their Debut Lp, in fact, the outro drum bridge of the song doesn't bring to the fine jazz section but cross fade with N.I.B. bass intro.