As an introduction, the accompanying instruments (guitar, mandolin, accordion, drums, and flute) play through the entire piece with the flute carrying the melody.  At its conclusion Yma enters on a floated high E flat.  The sound of her voice is so pure that, at first, one mistakes her voice for the flute.  The song is a spectacular vocalise and Yma's poise and confidence are immediately apparent as she darts up to high staccati, which dazzle the listener with their purity and effortlessness (up to G flat above high C).

One of the most impressive features of this song is the unpretentious display of Yma's pitch, which is remarkably exact.  Even without training, her ear is more acute than most classical artists of seasoned experience.  This was something Yma never lost; her singing was always notable for its excellent pitch.

After two (introductory) staccato descents from high E flat, Yma sings the main melody with round, full tone richly mixed with head voice. This gives her voice great height and freedom.  The only fault to be found in this selection (and others recorded at this time) is her failure to smoothly taper phrases.  These tend to dissipate as Yma's breath control depletes itself.  Typical of Yma's singing at this time, it would be corrected by the time she reached America.  Nonetheless, this is a healthy voice under commendable control.  At this stage of her career there is no sign of vocal manipulation or tension.  Despite the height she constantly reaches the voice is free and easily produced.

For the conclusion, Yma plucks another top E flat out of thin air and bravely sustains the note.  This particular attack was never easy for the Peruvian singer.  She preferred using a rising scale, or a prefacing "n" (to help place her voice securely in the head register - as in Amor Indio [Indian Love]) to reach her climactic high notes.  Because of Yma's insecurity with this type of attack, the final note becomes uncomfortable, straightens as it is held, and loses the necessary upper partials.

As a whole, the song is a brilliant success.  Entranced by the beauty of Yma's voice, listeners don't realize that during the course of the short, three-minute song, she had to sing high E flat twenty times.