THAT's a classic, yeah. Not sure I'd go for that, it is certainly longer than I want (which can be remedied). Not sure it's the vibe I'm wanting to feel though.I use "O' Fortuna" from the opera, *Carmina Burana".
I play it at beginning of every session and I have for decades now.
I ask my players to listen and imagine their PCs doing heroic things, battling mighty foes, etc. Most have found it works well and is inspiring.
But, I know it isn't to everyone's' tastes.
This YouTube is over 5 minutes, but my MP3 is about 3.5 minutes. Still, it might longer than you want.
Good input, either way. Thanks.