To the point: Are you a professional musician or an amateur looking for a one stop shop for your musical instrument needs? Then you must check out these music stores in the city!
1: Musicians Mall

Image Courtesy: Musician’s Mall
You can find products of leading instrument brands here. Their sales team is most helpful if you need help deciding what to buy. They also host classes for learning to play the guitar and drum. Visit their online store here.
Where: Opp. Charni Station, Laud mansion, Maharshi Karve Rd, Grant Road East, Girgaum
2: Skiffle Music

Their product range is quite diverse and their sales staff is quite knowledgeable. They stock instruments from many recognized and popular international brands. Check out their products here.
Where: Shop no.4, Mandpeshwer Kripa, Next to St. Francis Engineering College, S.V.Road, Borivali West
3: SoundMonk Musical Instrument Store

Image Courtesy: SoundMonk Musical Instrument Stores
These chain of stores located in Dadar, Bandra and Andheri are part of the music company SoundMonk Music that provides various other services like School of Music, Online School, Studio and Jamroom. You can check out their website for their products and services.
Where: Shop No 120, Ground Floor, Reporters Bungalow, Opposite ICICI Bank, Near Shopper’s Stop, S.V.Road, Andheri West
4: Shalu Music

Image Courtesy: Shalu Music
Established in 1998 and located near CST, this music store has a wide variety of musical instruments as well as studio equipments. They have another branch in Bandra. You can also get more details on their website.
Where: 138, Mahendra Chambers, D.N Road, Fort
5: Bhargava’s Musik

Image Courtesy: Bhargava’s Musik
Walk into this music store located in Bandra and Goregaon, and check out their huge display of instruments. You can ask the trained salespeople to help you out or get a look and feel of the instruments yourself before you to decide to purchase.
Where: 4-5, Imperial Plaza, 30th Road, Off Linking Road, Bandra West
6: Furtados

This list will be incomplete without mentioning the most iconic music store in Mumbai; Furtados. It has been around for more than 100 years and you can find almost any instrument here ranging from Indian classical to western. You can also find instrument cases, music books and many other things here. They provide teaching services at Furtados School of Music. You can also avail their products on their website.
Where: 540-44, Kalbadevi Road, Dhobi Talao, Opposite Metro Cinema