"Lil Rousin'" is a Charlie Rouse original from his 1960 album Yeah!, a blazing 12-bar blues in F that clocks in at nearly 240 beats per minute. Rouse delivers thirteen commanding tenor saxophone choruses, the extended solo serving as a comprehensive demonstration of his improvisational stamina and blues vocabulary. His playing combines bebop sophistication with deep blues feeling, his characteristic dry, angular tone cutting through the ensemble with distinctive clarity. The extended solo builds in intensity over its considerable length, with Rouse finding new ideas and fresh approaches to the blues form in each successive chorus. Billy Gardner follows with seven piano choruses that maintain the momentum, his playing energetic and blues-drenched. The track captures Rouse at his most uninhibited, free from the structural demands of Thelonious Monk's compositions and able to stretch out on familiar blues terrain. Dave Bailey's driving drumming and Peck Morrison's solid bass work provide an unwavering rhythmic foundation for the soloists' extended explorations. The tune's title, a play on Rouse's own name, suggests the spirited, rousing character of the performance, which ranks among the most extended and energetic blues blowing sessions in the hard bop catalog.