Mostly Music is supported by the following local businesses:
- Ambeli Greek Taverna, Cranford
- Bagel Chateau, Westfield
- Bederson Accountants
- Bramnick Law Firm, Scotch Plains
- Brunner Eye Care, Westfield
- Buona Pizza, Westfield
- Casa di Pizza, Westfield
- Chez Catherine, Westfield
- Evalyn Dunn Gallery
- Five Star Catering
- Froyo Frozen Yogurt & Ice Cream, Westfield
- Garden State Foot and Ankle Specialists
- Gersch Orthodontics, Westfield
- John E. Hilke, Optometric Physician, Cranford
- Inkwell Printer
- Irene Katz, Coldwell Banker Residential Sales
- Shari Kopla, Coldwell Banker Realty Broker
- Limani Seafood Grill, Westfield
- Martin Jewelers, Cranford
- The Musical Club of Westfield
- NJ Workshop for the Arts
- Dr. Andrea Sciarrillo, Chiropractic Sports Physician, Cranford
- Summit Family & Cosmetic Dentistry
- Ventura, Miesowitz & Keough law firm, Summit
- David M. Weinman, DMD, Westfield
