List of major opera composers
This list provides a guide to opera composers, as determined by their presence on a majority of compiled lists of significant opera composers. (See the "Lists Consulted" section for full details.) The composers run from Jacopo Peri, who wrote the first ever opera in late 16th century Italy, to John Adams, one of the leading figures in the contemporary operatic world.
Source: Wikipedia — List of major opera composers (CC BY-SA 4.0)