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To my knowledge it's the only time Bantam Books tried this kind of promotion. The band was probably hired, whether they were an existing band from Los Angeles, CA or a studio band created for the occasion. If the band already existed, the band name must have been changed accordingly for the record.
The only lead is the co-writer of both sides, "R. Allan", who might be the only known member. Mitchell co-wrote the two songs, and female lead vocals can be heard on the flip side, though I can't affirm it was sung my Mitchell herself.
The Restless Natives (Los Angeles, CA)
Wilderness Of Monkeys / I Had A Spring
Written by R. Allan and Paige Mitchell.
Bantam Records – 3235
1966
US