What properties make it suitable to be used for musical instruments?

Many properties can be listed out viz. durability, quality, the sound that it produces also depends on the material that is used, etc.

Explanation:

1. If you take wood then I would say maple, rosewood, cedar, walnut can be used to make "String instruments".

Reason:

The wood that we choose should be perfect and should give long-life to use the instrument.

2. If we consider about strings, then I would suggest that the material that you choose should be "ductile and hard".

Reason:

Thin wires can be drawn.

3. In case of Brass, it should be "malleable metal", so that the outcome of the instrument will satisfy the need.