Music Terminology: Bar?

Bars are basically a way of dividing up musical phrases into equal understandable parts. If you wrote a song without bars (impossible in the digital realm) it would be very difficult to keep track of what beat you were on and where you were in the song as a whole.

In 4/4 a bar consists of 4 beats and each beat is worth a quarter note. The tempo does not have an effect on this.

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Thank you very much.

As I know, "measure" in American English = "bar" in British English. I use both equally.

American English: Bar
British English: Pub

Just kidding, yeah I alway learnt that measure was an american thing like quarter note and crotchet etc.

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Actually, "measure" is straight from the Italian "misura" which is an acceptable synonym for "battuta" (=bar, or whatever). I believe the French use "mesure," too.

Involution.