"The primary one being, like I said, I don't like rock 'n' roll piano"

In this quote, Warren Zevon is expressing his dislike for rock 'n' roll piano. He is most likely referring to the design of piano playing that is frequently associated with rock 'n' roll music, which is identified by a strong beat and a great deal of energy. This style of playing is frequently used to develop a driving rhythm and to emphasize the beat of the song. Zevon is most likely expressing his preference for a more subtle and nuanced technique to playing the piano, which he believes is more appropriate for the kind of music he produces. He is likely recommending that the more aggressive style of rock 'n' roll piano playing is not appropriate for his own music. By revealing his dislike for rock 'n' roll piano, Zevon is emphasizing his own special technique to music and his choice for a more subtle and nuanced method to playing the piano.