Sister Donna Marie Beck is professor emerita and former director of music therapy at the Mary Pappert School of Music at Duquesne University in Pittsburgh, Pa. She is also a Catholic nun and the facilitator of a healing community drum circle.

Marc Anderson has a DVD/CD titled Drums in the Church: A Practical Guide for Percussion in Christian Worship. He teaches workshops and classes and is based in Minneapolis-St. Paul.

Bruce Adolph is the publisher of Christian Musician Magazine and Worship Musician! Magazine and produces the Christian Musician Summit conferences. He can discuss the role of drums in contemporary Christian worship. He is based in Puyallup, Washington.

Southern California InFocus bills itself as the largest Muslim newspaper in California, with a self-reported circulation of 25,000. It is based in Anaheim, Calif.

Radio Islam is a project of the SoundVision Foundation and has aired Islamic-oriented radio programs via the Internet since 1999. Programs include music, poetry, scripture interpretation, news and talk shows. Abdul Malik Mujahid is its executive producer. It is based in Bridgeview, Ill.

The society is a cultural and educational organization that works to build bridges between Muslims and other Americans. It has offices in New York City and North Bergen, N.J. Daisy Khan is executive director.

Read a Christianity Today article, “Peace on Earth? Christmas Carols and the Civil War.”

Read a pair of December 2003 columns by Terry Mattingly about carols: “A Caroling We (Don’t) Go” and “What is a ‘carol’ anyway?”

Kenneth W. Osbeck of Rockford, Mich., is the author of Amazing Grace: 366 Inspiring Hymn Stories for Daily Devotions (Kregel Publications, 2002) and Joy to the World: The Stories Behind Your Favorite Christmas Carols (Kregel, 2000).