Final answer:
The statement is true; in Free Jazz, musicians have the freedom to change the length of passages during improvisation which means a standard tune's measures can vary with each rendition.
Step-by-step explanation:
The question addresses a concept in Free Jazz, which is a genre of jazz music characterized by its avant-garde approach to improvisation and structure. The statement given is true. In Free Jazz, the traditional structures of a song, such as a 32 measure tune, can be altered during performances. Musicians have the creative freedom to extend or reduce the length of passages as they improvise, meaning that a 32 measure standard tune could indeed take 24 measures the first time through and 38 measures the next. This flexibility is a hallmark of the Free Jazz movement, which thrives on spontaneity, interaction, and the breaking of conventional musical rules.