Reference

According to Oliver Nelson's discography, the album that came before "More Blues and the Abstract Truth" is "The Blues and the Abstract Truth" (1961).

"The Blues and the Abstract Truth" is a jazz album that features a sextet of prominent musicians, including Freddie Hubbard, Eric Dolphy, Bill Evans, Paul Chambers, and Roy Haynes. The album is considered a classic of the jazz genre and features a mix of blues, modal jazz, and hard bop styles.

Here's a quote from the Wikipedia article on "The Blues and the Abstract Truth":

"The Blues and the Abstract Truth is an album by American jazz composer, conductor and arranger Oliver Nelson featuring performances recorded in 1961 for the Impulse! label." (Source: Wikipedia - The Blues and the Abstract Truth)

And here's a quote from the Wikipedia article on "More Blues and the Abstract Truth":

"More Blues and the Abstract Truth is an album by American jazz composer, conductor and arranger Oliver Nelson featuring performances recorded in 1964 for the Impulse! label." (Source: Wikipedia - More Blues and the Abstract Truth)

Image: The Blues and the Abstract Truth album cover

Image: More Blues and the Abstract Truth album cover