YYZ

YYZ's harmony is distinguished by its integration of progressive rock's power-chord vocabulary with jazz-fusion sophistication. The song avoids conventional chord progressions in favor of riff-based tonality where the key center is established through bass movement and unison figures rather than traditional functional harmony. The frequent time signature shifts (10/8, 7/8, 4/4) create a rhythmic complexity that interacts with the harmonic movement, making the tonal center feel constantly in motion. The middle section's jazz-influenced voicings and Geddy Lee's melodic bass counterpoint add harmonic depth that elevates YYZ far beyond typical rock instrumentals.

YYZ was born from drummer Neil Peart's fascination with the Morse code identifier broadcast by the navigation beacon at Toronto Pearson International Airport. The rhythmic pattern of the letters Y-Y-Z (dash-dot-dash-dash, dash-dot-dash-dash, dash-dash-dot-dot) became the song's signature opening motif. The band developed the piece collaboratively during pre-production rehearsals for Moving Pictures, building an elaborate multi-section instrumental around this deceptively simple rhythmic cell.

Rush's "YYZ" opens with the Morse code signal for Toronto Pearson International Airport before launching into a dizzying showcase of technical mastery. Released on 1981's Moving Pictures, it remains the gold standard for progressive rock instrumentals, blending complex odd-time signatures with melodic sophistication and jazz-fusion flair.