This fourth-edition RTF saw Al Di Meola's wah-wah guitar and Chick Corea's electric keys driving fast runs, impressing rock audiences. No Mystery balanced their power with softer acoustic moments. On the title track, Lenny White's marimba supports a lilting, memorable melody. Elsewhere, Stanley Clarke's lines drive "Jungle Waterfall," while Corea's piano plays solo on "Heavy Metal." Improvised "Interplay" reveals a less rehearsed side of these brilliant players. No Mystery was driven and ultimately impressive. Later, they moved into more tech-dominated music.