Proof that Lincoln was a music-lover?

[Gene C]

In the first episode is a story about Lincoln and the song "Dixie"
It seems that in 1860 when Lincoln was campaigning in Chicago he attended a comedy show and heard the brand new song "Dixie". He became so enthusiastic about it, he stood up and he shouted "let's hear it again". The show stopped and they performed the song again.
(story starts at the 4:20 mark)

I've never heard that story before. Has any one else?
I wonder what the source is.