Data Insight
The debut is the odd one out. Rutsey was still on drums, Peart had not arrived, and Lee and Lifeson wrote all eight tracks between them. From Fly by Night onward the sleeves stop listing one set of writers and start listing two, lyrics on one line and music on the other, and the split holds through every album that follows. Peart ends up with a lyric credit on 145 tracks, Lee with a music credit on 162 and Lifeson on 158. The gaps are small and they are all explainable: six instrumentals with nothing to write words for, a handful of early songs Lee wrote alone, five tracks Peart also had a hand in composing, and "Hope" on Snakes & Arrows, which Lifeson wrote by himself. Outside help almost never happens. Pye Dubois brought lyrics to four songs starting with "Tom Sawyer", and Peter Talbot co-wrote the words to "Closer to the Heart". That is the whole list.
Rush