Jazz pianist and arranger Jelly Roll Morton came up with great melodies, but he was also always thinking vertically. Solo piano works like “Froggie Moore” and “Tin Roof Blues” show his nimble skills at merging lines and creating new textures on a small scale, while “Grandpa's Spells (Take 3)” spotlights his talent for shifting the scope of his ideas and sounds—expansive to quiet, sparser to denser—while writing for a band.