KNOWLEDGE IS POWER
Perfect interval - Interval of an octave, fifth, or fourth without alteration.
Relative major and minor scales - Major and minor scales which have the same key signature.
Secco - "Dry." Unornamented.
Ternary form - Three-part form in which the middle section is different from the other sections. Indicated by ABA.
A due - Return to unison after divisi.