OH, Lovely! That is from the album Songs From The Wood... whole album is delightful. try this one:

The Whistler
- Jethro Tull, album Songs from the Wood

The first song i posted (Skating Away...) is from the album Warchild... which is the only album i had access too for a good while (now i have only Youtube). here is another:

The Third Hoorah
- Jethro Tull, album Warchild

the above used to be my favorite from Warchild, not sure if it would still be today if i reheard the whole album. but i love the baroque folk sort of feel to it.

in all of their music i love the rhythms and blends of various instruments, notably some percussive instruments and of course Ian Anderson's trademark flutework.

~ waves ~