DurationFromQuarters should not be here, should be in a package managing bpm and time Duration from quarters expects four quarters to occur per beat, (direct complaints at terry cavanagh), and returns a time.Duration for n quarters in the given bpm.

Open returns a Ceol from an io.Reader.

Ceol represents a complete .ceol file.

Filter represents a single entry in a .ceol's pattern's filter block.

Instrument represents a single entry in a .ceol's instrument block.

Note represents a single entry in a .ceol's pattern's note block.

Pattern represents a single entry in a .ceol's pattern block.