choir, choral singing, chorus, singing, a cappella music, show choir, barbershop music, arts and music, San Diego choir, san diego choirs, san diego chorus, san diego show choir, performing arts, musical theater, vocal music, stage entertainment, karaoke, entertainment, vocal harmony, vocal pedagogy, Glee (TV series), Pentatonix, Pitch perfect, open mic san diego, vocal performance, auditions, vocal auditions, san diego vocal auditions, san diego auditions, broadway theatre, san diego entertainment, live music san diego, event entertainment san diego, senior entertainment san diego, singing san diego, san diego sing, san diego a cappella, san diego barbershop music