Grandsire is one of the standard change ringing methods, which are methods of ringing church bells or handbells using a series of mathematical permutations rather than using a melody. The Grandsire method is usually rung on an odd number of bells: Grandsire Doubles is rung on five working bells, Grandsire Triples on seven, Grandsire Caters on nine and Grandsire Cinques on eleven.
Read more about Grandsire: History