Blue Bus

"Blue Cheer" was the name of a variety of LSD made by chemist and Grateful Dead patron Owsley Stanley13 and the band was probably named after that, although the name existed earlier, as the name of a laundry detergent14 after which the LSD variety itself was named." Wiki blurb that has it right. Take a ride on The Blue Bus LSD trip.

Take a ride on The Blue Bus