One of my all time favorite bands........saw this on Connie's rock history thread:
"9/14/1979: Jethro Tull released Stormwatch, their twelfth studio album and last to feature the group’s “classic” 1970s lineup. Drummer Barriemore Barlow and keyboardists John Evan and Dee Palmer all left the band in the months after the Stormwatch tour concluded in April 1980, while bassist John Glascock died during the tour."
I agree that it was the last classic sounding Tull lp...and a pretty good one at that.
Just a few words on Glascock...a great bass player, Blackmore said once, " John Glascock is a brilliant bass player, the best in the business in rock." At various times he played for The Gods, Chicken Shack, Toe Fat, Head Machine ,Carmen, and Jethro Tull and others. Barlow (paid for John's funeral) left at the same time...he was devastated by Glascocks death and upset that Anderson had not had a fairer contract with Glascock.
A short wiki piece
https://en.wikipedia.org/wiki/John_Glascock