Jonh Sebastian!
The songwriter for the song "Do You Believe in Magic", by "The Lovin' Spoonfull", was John Sebastian. He was a member of this band and wrote a lot of songs.
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It was written by John Sebastian of the group The Lovin' Spoonful.
Thomas Mann wrote The Magic Mountain.
Sarah Prineas wrote The Magic Thief.
The Lovin' Spoonful. I don't know who wrote the song.
If you mean in the Harry Potter books, Bathilda Bagshot wrote a History of Magic.
Australian writer and artist Norman Lindsay (1879-1969) wrote The Magic Pudding.
Pilot
You Made Me Believe in Magic was created in 1976.
We Must Believe in Magic was created in 1977.