Jilguero translates to "goldfinch," a small, colorful bird known for its beautiful song. It's a charming and somewhat uncommon word in everyday Spanish, making it stand out.
In the song, Joan Sebastian uses "Jilguero pa' cantarle a la ilusión" (Goldfinch to sing to illusion) as a metaphor for himself. He portrays himself as a free-spirited singer, much like a goldfinch, dedicated to singing about dreams and love, highlighting his romantic and artistic nature.
Joan Sebastian's "De Ellas" (Of Them) featuring Luis R Conriquez is a really interesting look at a man reflecting on his past relationships. He doesn't have much to say about the women themselves, but rather about the experiences they gave him, calling them "Tan bellas / Fueron las copas en que tuve que tomar" (So beautiful / Were the cups from which I had to drink). It's a poetic way of saying he found happiness and fulfilled his heart's desires through these connections.
He sees himself as an "incorregible" (incorrigible) dreamer, like a "río caudaloso" (mighty river) or a "manantial" (spring), always flowing with illusion and freedom. He admits that his past might lead some to blame him for being a "loco enamorado del amor" (crazy in love with love), and he offers his gratitude and a smile to the women, acknowledging that his "corazón traía prisa" (heart was in a hurry) and might have caused some sadness. It's a song about living life to the fullest, even if it means a few broken hearts along the way, and ultimately being grateful for every experience.