THE STARS THAT PLAY

https://en.wikipedia.org/wiki/The_Stars_That_Play_with_Laughing_Sam%27s_Dice 

"The Stars That Play..." was first recorded by The Experience at Houston Studios in Los Angeles, California in late June 1967, with a number of demos taped between June 28 and 30.[2] With the recording of "...Midnight Lamp" taking place throughout July, with the single completed by July 20, the B-side was also completed at the same time, with the basic track recorded on July 19 and additional overdubs and mixing taking place on July 29.[3] The track features a largely unidentified group of people referred to as "The Milky Way Express" providing backing vocals, whistles and other sounds, which is said to include musician Frank Zappa.[1] The song was also the first recording released by Hendrix to feature his subsequently characteristic wah-wah sound.[1]

[1] Shapiro & Glebbeek 1995, p. 527