If I have a simple 4/4 piece and at some point, for some reason, I delay the rhythm by 1 beat. How do I notate that particular irregularity on the staff?
I think having a bar with 5/4 without writing any extra notation would be really hard to read.
An example can be found in "Love Of My Life" by Queen. In this video it happens at 0:54. If you count the whole verse 1, the piano part at 0:54 will sound off-beat and the verse 2 will start on beat 2 instead of 1.