I play exclusively on-line...so there can be boring moments where side entertainment is needed. However, this depends on what is going on in a given session. Sometimes I play a few tourneys on different sites simultaneously which means I need to concentrate and is this instance, I do not even like music playing in the background.
If I am just on a single site and not multi-tabling, then I will have various things going on. For starters the TV is always on in the background but I can tune this out easily. Normally I have some ambient, fairly chilled music going on as well. But I will also play various other things on my laptop. Some are content I have stored on my computer (various subjects) but then like others I turn to You Tube.
Funnily enough, in recent weeks I have been watching a few quiz shows, some of the most arduous quiz shows on television. Its really stimulating to see how your own knowledge holds up against some very smart minds...and you learn countless things in the process. I will load up an entire series and over the course of many days complete the episodes and see who triumphs. It fits really well with playing poker.
That said, if any serious or complicated hand is developing, I just click the pause button!