There's something so epic about the blowing of a great horn before battle. I guess I should also admit I played the tuba in high school and college, so I suppose I feel a personal affinity for Heimdall the god of horn players!

Voluspa - Norse Mythology Book - Verse 46

“ Fast move the sons |  of Mim, and fate

Is heard in the note |  of the Gjallarhorn;

Loud blows Heimdall, |  the horn is aloft,

In fear quake all |  who on Hel-roads are.”

Bellows Translation