If you're interested in the Who
You can't go wrong with the "Who's Next" album. It's their masterpiece, and if you don't care for it, then you need not bother with them ever again.
Two of the CSI themes are here, "Baba O'Riley" which you saw them perform live above, and "Won't Get Fooled Again", the ultimate expression of political disgust (or is it disgust with politics?), and which ends with the greatest scream in all Rock and Roll, no exceptions. The third CSI theme is
"Who are You?", which is off their "Quadrophenia" album.
Another of my favorites here is "Behind Blue Eyes", which may just be one of the most moving songs ever written.
The first 9 tunes here are the original "concept album". Listen to them first, in order, and all at once if possible. They are not interconnected, they are independent songs, but they do tend to "fit together" in some deep visceral way that's hard to describe. The "extra bonus tracks" I can't vouch for, I've never heard them and as far as I know were never previously released. There's probably a very good reason for that.
I envy you. You're hearing Who's Next for the very first time. Far fucking out.