Musical Intervals & Scales Creator of instruments will need to define the tuning of that instrument Systems of tuning depend upon the intervals (or distances.
Huron: Interval-Class Content in Equally Tempered Pitch-Class Sets - Common Scales Exhibit Optimum Tonal Consonance
Music Theory the TLDR Version
Fingering Melodic Minor Scales
Music Theory; The TL;DR Version (1.0)