The Jethro Tull of late 60's to mid 70's was something else. I remember a couple of summers as a teenager back in the day playing "Aqualung" and "Thick as a Brick" until the needle on my SONY record player was going to fall off. All you needed were your Tull, ELP, Alice Cooper, Stones, CSNY, and Beatles LP's and you were styling and profiling! Do explore Tull's first 5 albums: This Was, Stand Up, Benefit, Aqualung, and Thick as a Brick. As killer a collection of albums as they come.
For rock with acoustic and classical tie-ins try: ELP, Procol Harum, and Renaissance.
Regards, Rich