This could be a reference to innovative hymn writers Josef Mohr and Franz Gruber who, in the early 19th century, hastily wrote the Christmas carol Stille Nacht for guitar in order to rescue the Christmas celebration of an Austrian church whose organ was broken. This hymn was later translated to English as Silent Night.

This could be a reference to innovative hymn writers Josef Mohr and Franz Gruber who, in the early 19th century, hastily wrote the Christmas carol Stille Nacht for guitar in order to rescue the Christmas celebration of an Austrian church whose organ was broken. This hymn was later translated to English as Silent Night.

This could also simply be a reference to Contemporary Christian Music (CCM), which is used in a lot of non-traditional Christian services in the USA (and probably elsewhere). CCM relies heavily on secular pop music styles and is often rock guitar-heavy.