"Even"! LOL %^)

A compact source is _Burns: Complete Poems and Songs_, ed. by James Kinsley (Oxford U.P., 1969; paper, 1971). It includes tunes of the songs, and a substantial glossary.

You can also listen to his _Complete Songs_, a set of 13 CDs (Linn Records, 1995). It includes some songs that he did not write, but collected & edited.