the last question is relevant so i will answer it.
Yes, very legal on two fronts.
1. The casino pays a royal fee to one of the music industry elements that handle it...i think in Canada it is called 'SOCAN' and they in turn return those fees ...
2. I use what are called midi files....so my computer plays the parts i do not....drums, bass etc....and when i purchase the file i pay a royalty performabce fee included in the cost of the file so i can legally play them.
the rest compares to comparing apples to oranges....you want to hear a michael jackson song so bad....buy it. anything else is robbing those who created it.
why do you think people record and SELL music Tim? so that 5 people can buy it and 2,000,000 can copy it?