high notes and complexity in the early 70s

I've recently discovered Sparks. The high drama and operatic vocals remind me of early Split Enz, Mental Notes (1975) especially. Split Enz were very influenced by Roxy Music and I wonder if they were aware of the Mael brothers, especially 1974's "This Town Ain't Big Enough For The Both Of Us." The similarity also extends to the appearance of Sparks and Split Enz. Both groups wore crazy garb, however, so did Bowie and the general glam rock soup of the era.
Morrissey's tour-buddy Kristeen Young, with her aggressive keyboarding and confronting vocals, recalls the flavours of that era but there is a key ingredient missing. I saw her support Morrissey last year and I found her caterwauling nauseating. It was TOO TOO much. If she just pulled back a little she could be sensational. There is definitely something there but her approach is too rich, she needs to hold back on the punch and focus on the underlying flavour base. It's death by delivery- one bite is enough.