A riff is a strongly-rhythmic, repetitivecontinuo that drives the piece along.
"Riff" is a jazz and rock device and term, and the riff is rare in other stylesbut could be said to have an ancestor in the passacaglia - lit. "walking" -bass lines developed by Baroque composers.
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It depends on what exactly you're writing about. Easiest is chronological. Start at the beginning and work your way through. The out line below would be for a piece of music Intro (ie for a piece of music-title, who wrote it, when it was written, where if interesting, why is it important.) 1st movement or period important or interesting points 2nd movement important or interesting points (may be more than three) etc.
dynamics is how loud or quiet a piece of music is
The word form means the structure of a piece of music. The base of the music basically.
It's called sheet music.
A metronome.