Ortelli is well known in the southern Alps regions of Italy, Austria and Switzerland for being the composer of the famous Trentino folk song "La Montanara" (The Song of the Mountains). Ortelli wrote the melody and lyrics in 1927 while being on an excursion in the mountains. Luigi Pigarelli has added other vocal parts to harmonize it to a choral piece. It has been translated into 148 languages.
- Original lyrics and English translation of "La Montanara" at the Wayback Machine (archived October 26, 2009)