Abstract: A musical instrument warmer including a horn in combination with a cover for warming. A warming means is positioned around the horn for heating. The warming means is provided with an electrical power source for activation. Whereby, providing power to the warming means raises the temperature of the warming means for heating the valves when temperatures being below 32.degree. Fahrenheit. Lastly, the cover has a body member with a front side and a rear side. The body member is formed by attaching two layers of a fabric. The front side of the body member has a cone-like portion projecting outwardly. The body member is adapted to be removably mounted onto the horn when the heating means is positioned on the horn. The body member retains heat generated by the warming means therein, when the warming means is activated.