To hear a MIDI file of this beautiful song click here:
Beautiful and moving lullaby written by Colombian composer Jaime León (1921). The poem is by one of the most important Colombian poets, Eduardo Carranza.
At the Mundo Arts site you can find a file with the translation of the poem to English, an IPA transcription of the poem as well as an Mp3 with the poem recited by a native speaker. You can also find two comprehensive books with complet works by Jaime León.