glee

Short definition from Wiktionary

Noun

1. 1
   Joy; happiness; great delight, especially from one's own good fortune or from another's misfortune.
2. 2
   Music; minstrelsy; entertainment.
3. 3
   An unaccompanied part song for three or more solo voices, not necessarily merry.

Verb

1. 1
   To sing a glee (unaccompanied part song).