Solo includes fifteen tracks, some previously released. There are four improvised tracks inspired by
John Coltrane's
Giant Steps: "Paseo Iluminado", "Paseo en Media Luz", "Paseo Azul", and "Paseo Morado". "Silencio" is a tribute to Cuban
boleros. A reworked version is included on
Solo, and is described as having an "intensely meditative character and slow deliberation," and "a more complex higher level of communication" than the original version. "
Here's That Rainy Day" is a jazz ballad, recorded earlier for the album
Inner Voyage, with an arrangement described as "breathtaking" by Ken Dryden of Allmusic. The first version of "Quasar" can be found on
Paseo (2004); and the version included on
Solo is described as "seven minutes of drama," by Calder of
PopMatters, with "a sprawling, improv-heavy composition that runs Rubalcaba up and down the keyboard." ==Reception==