Recently I've found out that two of the most famous Italian singers, Francesco De Gregori and Fiorella Mannoia, share not only their hair colour, but also the date of birth (4th April) and the place of birth (Rome).
Francesco De Gregori (1951) is a singer-songwriter, known as "the prince of the singer-songwriters". He started his carreer at the end of the 60s and is still working. His hair is now white and as an adult it got brownish, but there are several reports of it being red. He also wrote a song (probably autobiographical), titled Il ragazzo, about a red-haired boy.
"Uno spilungone di 24 anni, con la barba e i capelli rossi..." (A 24-year-old beanpole, with a red beard and red hair...) https://www.iltitanic.com/NOSTROMO.HTM
"Uno di questi era un ragazzo della mia stessa identica età, molto alto, molto magro, i capelli molto rossi, l’aria un po’ timida." (One of these was a boy of my age, very tall, very thin, with very red hair and a little shy). https://www.lavocedinewyork.com/arts/2016/07/26/francesco-de-gregori/
"Occhialuto e ben nascosto dietro delle spesse lenti nere, barba, capelli rossi, alto e bello." (Bespectacled and well hidden behind thick black glasses, bearded, red hair, tall and handsome). https://www.shockwavemagazine.it/musica/francesco-de-gregori/
Here's the video of his song Titanic.
Fiorella Mannoia (1954) too started her carreer at the end of the 60s. She looks very Irish and even wrote a song about Ireland, Il cielo d'Irlanda, which you can see below.
And here's a song, La storia, with Mannoia and De Gregori together.