Band/artist documentaries.

" [. . .] it’s such a fine  line, I hate to see it go [. . .]"  from Cocaine/Jackson Browne/Running On Empty/Electra Asylum 1977/"Recorded in room 124 at the Holiday Inn, Edwardsville, Illinois-8/17/77."  (I presume he was performong at MRF Edwardsville.)

@wharfy , when I read your post I thought maybe it was this performance that you were alluding to

Bing Videos

and I was going to say I kind of liked Nicks husky sound which I was thinking may have been attributed to the use of some cocaine, but I do see where this performance was from ’76, so I guess not.

How about Linda Ronstadt, the Simple Dreams album?  I always thought (and still think) that Linda’s voice had a nasal (but not objectionable quality) to it.

And Eric Clapton/Slowhand?  When he recorded that one his voice was definitely suffering from what I am thinking were certain excesses.  Cigarettes and what have you.  

Martin Scorsese developed quite a coke habit in the 1970’s (I believe when he and Robertson were at one point living together in L.A.), and on one binge overdosed, ending up in the hospital.

Martin Scorsese developed quite a coke habit in the 1970’s (I believe when he and Robertson were at one point living together in L.A.), and on one binge overdosed, ending up in the hospital.

It sure looked like both Robertson and Clapton had been into the happy powder pretty heavy when they were playing together. . . .

. . . and speaking of indulging in happy powder, check out Steve Earle in Austin (1988) doing San Antonio Girl for an encore:

Steve Earle - "San Antonio Girl" [Live from Austin, TX]

This is Linda Ronstadt on Glen Campbell’s Good Time Hour (1971), doing Long, Long Time solo and then a duet (Carolina In My Mind) with Glen.  When I first watched it several years ago on Tubi, my initial impression was that her voice was sounding on the nasal side, and then before she gets started singing with Glen the side of her hand goes up to her nose and there is that telltale "snarff." . . .

Linda Ronstadt & then Glen Campbell - Long, Long Time & Carolina in My Mind