I've just had a look at the sheet music for "Crazy Little Thing Called Love".

The time signature throughout the song is in 4/4 at all times. The section that I suspect sounds like it might be 6/4 to you are two 1/4 note triplets.

A triplet is three notes played in the speed of two. So these three quarter note triplets are played in half a bar of 4/4 (i.e. the time it takes for two ordinary 1/4 notes).

In total, the two groups of 1/4 note triplets back to back means that six evenly spaced notes are played in the time that it takes 4 beats to play.

It's what musicians often call a 3 against 2 rhythm. The image below shows how the four beats line up with six triplet notes.

Notice how the second beat in 4/4 come midway between the second and third note of the triplet. This also happens with fourth beat of 4/4 coming between the second and third notes of the second triplet.

I hope this helps.

Regards,
Noel

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