| Business | Phone |
| Ars Nova Singers 890 Morgan Dr, Boulder 80303 | (303) 499-3165 |
| Black Tie Piano Boulder 80302 | (303) 494-7190 |
| Celtic Harp-Polly Mahoney 1230 Wildwood Rd, Boulder 80305 | (303) 494-0596 |
| Harpsong Classical & Celtic Boulder 80301 | (303) 440-0543 |
| Lyric Ensemble 3156 9th St, Boulder 80304 | (303) 442-2025 |