I do. I"ve learned many musics because i do alittle bit of keyboard and guitar and plus i downloaded thousands of midi and i always listen to them. Also other songs that i've h eard, they just stick and i memorize them. It's interesting, i can't learn things and i can't speak well maybe i have a learning disability with words and math but  I can memorize melodies and whole songs. 

It's fun, i've learned a lot of them by heart and i hum them or whistle them often, even at work. 
And not just pieces of it, i do the full songs. 

I dont know about you, but it's fun and it inspires me. 

For my Poser movie( not fully animated but more like static poses that change sometimes ) one of the scenes i'm going to record the character whisling a whole sng's melody while the  orchestra plays in bground.