Ragazzi Boys Chorus explores cultural ideas through music in “Celebrations of the Season: Stories of Our Immigrant Heritage,” performing works from Poland, Ireland, Italy, Mexico, China, and Africa. “Celebrations of the Season” — with the participation of Ragazzi’s Avanti, Concert Group, and Young Men’s Ensemble — will be performed on Dec. 7 in Palo Alto, Dec. 8 in San Francisco, and Dec. 15 in Burlingame.

Meanwhile, “graduates” of the chorus, Ragazzi Continuo, offer the holiday concert series “Winter Wonderland” on Dec. 15 in Redwood City, Dec. 21 in Palo Alto, and Dec. 22 in San Francisco. The diverse holiday program ranges from Harold Arlen and Ted Koehler’s “Stormy Weather” to a Mozart canon to popular holiday classics such as “Rudolph the Red-Nosed Reindeer,” “Walking in a Winter Wonderland,” and “Frosty the Snowman.”