Ruiseñor translates to "nightingale". It's a beautiful and somewhat poetic word that evokes imagery of nature and song, making it stand out from more common vocabulary.
In the context of the song, the singer directly addresses the nightingale, expressing his sorrow ("Tengo pena al corazón"). This personification adds a layer of emotional depth, as the nightingale, known for its beautiful song, becomes a confidant for the singer's heartbreak. It's a memorable and evocative choice that hints at the song's lyrical beauty.
This song is a beautiful and poetic expression of heartbreak. The singer feels like he's serving a sentence ("Cuando cumpla mi condena"), waiting for a future time when the pain of a lost love will finally fade away. He describes being exhausted from singing his lover's name, yet he's still trapped, moving to her rhythm ("vamo' bailando a tu son").
The lyrics reveal the source of this sorrow: a woman named María no longer wants to see him. His solution? To leave for Andalucía. There's a powerful sense of destiny here, as he sings, "Ya mi mamá me decía cantaría esta canción" (My mom already told me I would sing this song), suggesting this heartbreak was a fate he couldn't avoid.