Brian Jones recording at Olympic Studios, London 1967.

"Brian Jones was the unsung hero of the band – by far the most prolific and imaginative musician among the Stones, pushing the musical boundaries with passion. His ability to master difficult instruments such as the sitar and the Indian shenhai (a type of double reed wind instrument) made for very interesting sounds on the Stones records. He was a good friend of Jimi Hendrix's and would hang out on his sessions…then fall into a heap on the control room floor." 
~ Eddie Kramer