Noun
(mathematics) a progression of terms whose reciprocals form an arithmetic progression
Source: WordNetFor Glass this series demonstrated a new start, hence the title: "What I was looking for was a way of combining harmonic progression with the rhythmic structure I had been developing, to produce a new overall structure. Source: Internet
This simple melodic and harmonic progression had served as an inspiration for many baroque composers, and would be used by later romantic and post-romantic composers. Source: Internet