Sometimes, music with lyrics in the language I'm learning. I don't understand most of it, but my ear gets better at picking out words, and properly-conjugated

Sometimes, music with lyrics in the language I'm learning. I don't understand most of it, but my ear gets better at picking out words, and properly-conjugated phrases start to sound natural to me, even if I don't know what they mean yet. But that's only when I feel I need to be pulled along. Once I get into flow, I don't see or hear anything except what I'm doing. My music will end and I won't notice until 2 hours later when I come up for air. In "Peopleware", DeMarco and Lister are even more explicit: if programmers need to put on headphones to drown out ambient noise, they're using up the very creativity they're being paid so much for.