El dulce cantar del monte (The Sound of Music reprise) (The Sound of Music, 1965 film cast, Spanish)

sung by The Children and The Captain (dubbed by Alberto Aguilá)

titled differently—as "Sonrisas y lágrimas" (reprise)—in the Spanish 40th anniversary edition of The Sound of Music (which is the reprise of the title song, as indicated above). the alternate title "El dulce cantar del monte" is derived from the opening line of the title song.

http://castalbums.org/recordings/Sonrisas-y-lagrimas-1965-Spanish-Soundtrack/5433/ (track 2.8)

see song lyrics at page 8, "Sonrisas y lágrimas") http://www.eldoblaje.com/musical/SONRISAS%20Y%20L%C3%81GRIMAS.pdf

LOS NIÑOS (Children)
El dulce cantar que susurra el monte
Inunda mi ser de alegre latir.
Huyó mi pesar y, al son de un murmullo,
Mi alma llenar de ilusión sentí.
…

video of opening title song "Sonrisas y lágrimas" w/ spanish dub, featuring Maria (Julie Andrews): https://www.youtube.com/watch?v=S7J9JWnpUTU