In music, CCM most commonly stands for “Contemporary Christian Music,” which is a genre of modern popular music whose lyrics focus on Christian faith and themes.

In vocal pedagogy and some music education contexts, CCM can also mean “Contemporary Commercial Music,” a broad term for non-classical styles such as pop, rock, jazz, and similar genres.

If you saw CCM in a church or Christian radio setting, it almost certainly means Contemporary Christian Music, while in voice-teaching or stylistic discussions it often refers to Contemporary Commercial Music.