Bobby Ingano performed the "Tropical Swing" melody. Ukulele, without a doubt, making the mood even and calm when playing in the melody, like this one. It has many strings passages that make the music of Hawaiian style (in addition to the presence of guitar in it as a mandatory attribute). There is no voice in this melody. But it has benefited from the execution like this.
Reference: Listen Free to Bobby Ingano - "Tropical Swing" on iHeartRadio