Changing BPM and its corresponding pitch?

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-- Changing BPM and its corresponding pitch?

Posted by supermaneric on Nov-27-2012 16:13:

Changing BPM and its corresponding pitch?

A question i want to ask is, when we sync songs or change its tempo, the pitch of such song will also change. What i want to know is by how much? so like a change in 2bpm will correspond to how much pitch change or more precisely if it will just be an small percentage key change that will not relate to a particular key or it will change from say Am to A#m .

Posted by Stu Cox on Nov-27-2012 21:03:

A change of about 5.9% is about 1 semitone (Am -> A#m).

These multiply together rather than add though... a change of +5.9% is actually a multiplication of 105.9%, so you hit the 2nd semitone (Bm) at 105.9% x 105.9% = 112.14% (i.e. around +12.1%)

6% per semitone is an accurate enough approximation

Posted by supermaneric on Nov-28-2012 10:54:

okayy thanks cause i was thinking that if a slight change in bpm correspond to a a rise or lowering of pitch then it opens up alot of live mashups but 5.9% is quite a bit so

Posted by Dykes_on_Jay on Nov-28-2012 12:18:

you didn't google such a simple answer first so your means nothing.

Posted by supermaneric on Nov-29-2012 04:44:

quote:
Originally posted by Dykes_on_Jay
you didn't google such a simple answer first so your means nothing.

i did... you can't exactly trust everything yahoo answers say... so whats your point?

Posted by Stu Cox on Nov-30-2012 07:37:

quote:
Originally posted by supermaneric
okayy thanks cause i was thinking that if a slight change in bpm correspond to a a rise or lowering of pitch then it opens up alot of live mashups but 5.9% is quite a bit so

On the flip side, you get a bit of tolerance:

Take two tracks in the same key which are 2 BPM apart, once you've beat matched them they'll probably still sound in key (= mashup time)...

If, hypothetically, +2% corresponded to 1 semitone, two tracks in the same key even 1 BPM apart would probably clash once you've beatmatched them.

Posted by Trance Android on Dec-28-2012 11:10:

Listen to Stu, the man knows his onions Regards the 6%, I like to use 3% & my reasoning for this is that anything greater than 3% (ie the mid way point) is closer to the next semitone up or down than it is to the original