bordonbert
- Posts : 1787
Join date : 2015-01-28
Age : 72
Location : Southern England
by bordonbert Wed Aug 24, 2016 5:58 am
Depends on the time signature of the piece, another forgotten aspect nowadays. It's generally just assumed that we are playing in 4, 5, 6, 7 or 8 beats to the bar and their value is ignored. That's a natural consequence of not using manuscript and musical notation to record pieces any more. With everyone playing basically improvised parts which are never intended to be the same, that works out fine. Most of the time!
If you're playing in 4/4 at 100bpm then there would be 100 crotchets (1/4 notes) per minute and each crotchet is two quavers (1/8 notes). So each crotchet is 0.6s or 600ms, each quaver is 300ms, and a dotted quaver is 450ms. That's the common case and could be assumed to be what is "standard".
If you're playing in 4/8 at 100bpm then there are 100 quavers per minute with each one being 0.6ms and hence a dotted quaver is 900ms. That's a bit slow for a 4/8 time signature really but theoretically fine.
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