Monica sent us a link to the following
Joni reference in this book by Gavin Pretor-Pinney.

Page 171:
Joni Mitchell, the hippy Canadian songwriter, likened them [Cirrus clouds] to floes of angel hair in her 1969 song, "Both Sides Now". Presumably, this is after the angel has used the most heavenly conditioner.

Glad you spotted this, Monica!

(Contributed by Monica)