Vibrations are an integral part of music. They're how deaf people can enjoy music and dancing. They feel the rhythm and vibrations even if they can't hear the tones of the instruments or voices.
In the general sense of "vibes", my perspective is that it's something subliminal, that's hard to put into words. It's like when an artist knows if something feels wrong or feels right, in proper balance (which doesn't necessarily mean perfect mathematical symmetry). It's something that makes a person feel relaxed when it's right, or uneasy when it's not.
This is something that used to drive my grandmother nuts - me taking so long to decorate the Christmas tree every year. I wanted it to be perfect from every possible angle where people could see it - colors, shapes, whether or not a decoration was shiny or not, how things would catch the light (and not be a danger or temptation to the cats), and this wasn't just a couple-of-hours thing. One year it took me nearly 3 days to get it just right - because up until then the vibes weren't right.
