Passage Summary: People thought rock music would get more artistic if songs could be longer than three minutes, but it actually became messy because the original style of rock wasn't built for long tracks.

Reasoning: Rock music's foundational styles were not designed for long songs, so when the three-minute radio limit was removed, the music became aimless and song structures collapsed.

Analysis: Since this is a 'Most Strongly Supported' question, we are looking for a deduction based on the provided facts. The historian suggests that the commercial constraint of the three-minute limit actually provided a necessary structure that rock's inherent style lacked. Look for an answer that suggests the removal of these limits didn't lead to the 'artistic' improvement critics expected. The core conflict is between the musicians' desire for freedom and the stylistic limitations of the genre itself.