Church bells or chimes rung in celebration of a wedding.
The Century Dictionary (Public Domain)
Use "wedding-bells" in a sentence
"That the story can end in the old-fashioned way with wedding-bells: ‘so they married and lived happy ever after’!"
"It is years ago, now, since their wedding-bells rung out from the church-tower of Hazlewood, blending with the sweet spring-air and sunshine of a joyous May-day."
"And then the wedding-bells begin to ring, and "the joy of the Lord is our strength!""