Tall fescue is fairly distinctive. Look particularly for the prominent veins in the leaf blades. Do a little digging; quackgrass has rhizomes--tall fescue does not. Naturally you could have both--and poa is not out of th question either.
This is interesting. Search Google, and click from the top images. Then click the camera and it will identify whatever it is you are trying to view ..plant animal or whatever.
No chance it will get this right--and it did not do too well when I tried a phot of henbit--but why not try it?