The song tells of 2 people reminiscing of the past and how they should sing the song of the present; and not looking back to the past.
DATEKEN usually gives a description on what his "made up language" (common in folk) means, such as in "Jutenija", though in this song "al a re ya" has no real meaning and is only a sound he once made when he woke up.
This song has entered the Hall of Fame. It is featured in the album Vocalogenesis. It's also been covered by various utaites and in various languages (Japanese, Chinese, Korean, English covers).
It is often mistaken for a Japanese folk song, however it is best described as a Chinese folk song with Japanese lyrics. Due to Len's use of a đàn nguyệt, it may also be considered a Vietnamese folk song.
DATEKEN stated the "meaning" to "al a re la ye" is the sound he made when he woke up from bed. Essentially, it has no definite meaning.
This is DATEKEN's first song to have achieved the title "Legendary Kagamine Master" in Nico Nico Douga
This is also his first song to have reached Nico Hall of Fame (exceeding over 100,000 views)
The instrument Len is playing is a đàn nguyệt, while Rin plays the Erhu.