A device for serving interchangeably as a waist belt and a strap for a musical instrument composed of a flexible elongated member of sufficient length to support a musical instrument on the shoulder of a musician and yet adaptable and wearable as a waist belt with extra length of the elongated member concealed. The elongated member has integral strap apertures on left and right ends for placement on strap buttons of a musical instrument. The elongated member also has integral belt apertures on the middle portion between the right and left ends for attachment to one end of the elongated member by means of an attachment belt hook affixed to that end when the device is worn as a waist belt normally used to support a garment such as pants with belt loops.