“Effect of Familiarity With Background Music on Performance of Simple and Difficult Reading Comprehension Tasks”, O. Mark Hilliard, Philip Tolin1979-12-01 (music distraction)⁠:

For 64 undergraduates varied musical selections did not offset scores on Sequential Tests of Educational Progress but scores on the easier sections were higher than those on more difficult ones.

Scores made with familiar music were higher than those with unfamiliar music.