With 1987's Sister, Sonic Youth revealed that they were a great rock band as well as a great art band. From the shifting dynamics and disquieting mood of the opening track "Schizophrenia" to the ferocious coda of "White Cross," Sister was the work of a band that had grown impressively stronger and more unified. The sheets of sound that issued from Thurston Moore and Lee Renaldo's re-tuned and modified guitars were still the core of their sound, but Sonic Youth's songcraft was steadily improving as they made more effective use of their aural palette and created a melodic context that helped their noisy report make greater dramatic sense. After going through a handful of drummers, Steve Shelley finally gave the force that they needed behind the kit, the steady pulse and rhythmic shadings helped firm up the tunes and added some discipline to Moore and Renaldo's exploratory guitar work that made their twisted instrumental figures more impressive and no less distinctive. And the warmth and clarity of Bill Titus' all-analog engineering made the guitars (and Kim Gordon's bass) sound as glorious as they always deserved; while Sonic Youth had been a band with great ideas, Sister was where the execution finally caught up with the concept, and it was their first truly great album.