I had a difficult time finding a comprehensive list of instruments used in D&D with reference pictures. So I decided to make one, to avoid having to search each instrument every time I roll a new character. Please leave a comment with any missing instruments and I will add them when I have the time.
Disclaimer: All the information below is not owned by me, it is either from Wikipedia or Wizards of the Coast
Bagpipes | 30 gp | 6lbs.
Bagpipes are a type of wind instrument that use a bag filled with the help of a mouthpiece to provide the necessary flow, while the sound came from the attached reed or reeds with different holes to vary the tone.
Drum | 6 gp | 3lbs.
The drum is a member of the percussion group of musical instruments. Drums consist of at least one membrane, called a drumhead or drum skin, that is stretched over a shell and struck, either directly with the player’s hands, or with a percussion mallet, to produce sound
Dulcimer | 25 gp | 10lbs.
The dulcimer a percussion-stringed instrument which consists of strings typically stretched over a trapezoidal resonant sound board. The dulcimer is set before the musician, who in more traditional styles may sit cross-legged on the floor, or in a more modern style may stand or sit at a wooden support with legs. The player holds a small spoon-shaped mallet hammer in each hand to strike the strings.
Flute | 2 gp | 1lb.
The flute is a family of musical instruments in the woodwind group. Unlike woodwind instruments with reeds, a flute is an aerophone or reedless wind instrument that produces its sound from the flow of air across an opening.
Lute | 35 gp | 2lbs.
A lute (/luːt/) is any plucked string instrument with a neck and a deep round back enclosing a hollow cavity, usually with a sound hole or opening in the body. It may be either fretted or unfretted.
Lyre | 30 gp | 2lbs.
The lyre (/ˈlaɪər/) is a stringed musical instrument. A classical lyre has a hollow body or sound-chest (also known as soundbox or resonator). Extending from this sound-chest are two raised arms, which are sometimes hollow, and are curved both outward and forward. They are connected near the top by a crossbar or yoke. An additional crossbar, fixed to the sound-chest, makes the bridge, which transmits the vibrations of the strings.
Horn | 3 gp | 2lbs.
A horn is any of a family of musical instruments made of a tube, usually made of metal and often curved in various ways, with one narrow end into which the musician blows, and a wide end from which sound emerges.
Pan Flute | 12 gp | 2lbs
A pan flute (also known as panpipes or syrinx) is a musical instrument based on the principle of the closed tube, consisting of multiple pipes of gradually increasing length (and occasionally girth).
Shawm | 2 gp | 1lb.
The shawm (/ʃɔːm/) is a conical bore, double-reed woodwind instrument. The body of the shawm is usually turned from a single piece of wood, and terminates in a flared bell somewhat like that of a trumpet.
Viol | 30 gp | 1lb
The viol (/ˈvaɪəl/) is any one of a family of bowed, fretted and stringed instruments with hollow wooden bodies and pegboxes where the tension on the strings can be increased or decreased to adjust the pitch of each of the strings.