Horn in D&D 5e costs 3 gp, weighs 2 lb..
Several of the most common types of musical instruments are shown on the table as examples. If you have proficiency with a given musical instrument, you can add your proficiency bonus to any ability checks you make to play music with the instrument. A bard can use a musical instrument as a spellcasting focus. Each type of musical instrument requires a separate proficiency.
Frequently Asked Questions
The Horn costs 3 gp in D&D 5th Edition.
The Horn weighs 2 pounds in D&D 5th Edition.