Hi lily,
I'm Spanish, so I can send you as many songs as you want. To begin, I'm sending you a song by a Spanish singer called Amaral. I think her letters are well understood.
https://www.youtube.com/watch?v=zvk8hT4uMcY
Enjoy!
Te recomiendo, el disco "Los poetas" de Joan Manuel Serrat. Son canciones basadas en poemas con un castellano perfecto. El cantante tiene un acento regional pero casi imperceptible
I recommend the album " Poets " by Joan Manuel Serrat. They are songs based on poems in perfect Castilian . The singer has a regional accent but almost not percetible
With lyrics
https://www.youtube.com/watch?v=_qRce0_Gynw