Basics, time signatures

Basics – how time signatures work.

The most common time signature is 4/4. Most of us know that means four beats in a bar, but is that all it means? If it is, why are there two fours?

It means a little more.The first 4 tells you that there are four beats in a bar, and the second four tells you what kind of beat they are.

They’re crotchets, or if you’re American, quarter notes. That’s what generally gets referred to as a ‘one beat’ note.

So a 4/4 bar contains four of these:

If you change the first number you just get a different number of these crotchets, eg 5/4. Here’s a famous song with five crotchets in a bar. Count along and you’ll see what I mean

[youtube=http://www.youtube.com/watch?v=DDOgYw5-pNs]

What if we change the second number?

The second number represents the kind of note we’re counting, so 4/4 is four crotchets, whereas 4/8 would be four quavers (or, for the Americans, eighth notes). Quavers look like this, and they’re ‘worth’ half a crotchet:

We generally use these in time signatures when we’ve got a song that has lots of quicker notes. Often they’re arranged in groups of three. For example in this next song you can clearly hear four little groups of three being picked out by the guitar. Four times three is twelve, so this song is in 12/8. Get it?

[youtube=http://www.youtube.com/watch?v=mYgLng4qbe4]

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