In my HD there is a rare artifact titled "Butterflydelia" with 45 tracks. I don't remember where I got it.
Here is the song list:

abedul - the monster & the butterfly
Beachwood sparks - Sleeping Butterfly
Bee Gees - Butterfly
Benitez - Butterfly
Bob Lind - Elusive Butterfly
Bread, Love & Dreams - Butterflyland
CATCH - The Dandelion And The Butterfly
Cher - Elusive Butterfly
Cheryl Dilcher - Butterfly
Coconut Mushroom - Like a Butterfly
Complex - Norwegian Butterfly
Corbett Mike & Hirsh Jay with Hugh McCracken - Butterfly Day
dave n lee - i can see the colours of the butterfly
David Garrick - Flutterby Butterfly
Devendra Banhart - Lazy Butterfly
Dolly Parton - Love Is Like A Butterfly
Equals - Butterfly Red White And Blue
Fat Mattress - Iridescent Butterfly
Folk 5 - Butterfly
henry smith - addresses a butterfly
Human Beast - Brush With The Midnight Butterfly
Jan Schim - Butterfly
Los Brincos - Butterfly
Marcus (Rusty Evans) - Butterfly Girl
Marmalade - Butterfly
My Kind Of People - Nobody Knows Why The Butterfly Died
Nicky James - Silver Butterfly
Paul Masse - Butterfly Lake
Petards - rainbows & butterflys
Pink Floyd - Butterfly
QUILL - Yellow Butterfly
Shocking Blue - The Butterfly and I
Simon Bloom - Hollow Butterfly
Sundays & Cybele - Butterfly's Dream
The Balcony Stars - The Butterfly Girl
the fox - butterfly
The Hammers - Little Butterfly
The Nightcrawlers - My Butterfly
The Springtime - Better Fly Butterfly
The Strongs - Flying Like A Butterfly
The Untamed - Butterfly
Unit 4+2 - Butterfly
Verve - Butterfly
Wade And The Nationals - Butterfly
Wildflower - Butterfly

If you are interested I can send it to you.

Spanish songs (Buterffly = Mariposa):

Los Negativos - ¿Quién Aplastó La Mariposa? (Very Good)
Danny Daniel – El Vals De Las Mariposas
Aquarius - Mariposa
Los de la Torre - La Mariposa Intranquila
Los Brincos - Butterfly

Miguel Abuelo - Mariposas De Madera (Argentina)
Los Xochimilcas - Pobre Mariposa (Mexico, Instrumental)

If you make an updated list it will be very easy to add new songs.

Greetings from Spain
Jose

sadly the author of this thread has passed on RIP Steve

I hope you fly surrounded by butterflies

An interesting person was Steve. RIP.

dear Steve, someone who knew what he liked and indeed what he didn't! I'd like to think that we learned to understand and live with his mood swings. RIP fella

Sorry to hear of the passing of Steve - I don't post much but I do visit every couple of days...
and I do remember reading his posts.
On the topic of butterflies in lyrics, for 'Julia' by Walter Ghoul's Lavender Brigade - have a listen:
https://youtu.be/YmJla_dQglo