Doraemon no Uta (Sakoto Yamano) - Doraemon Opening Song

The second version of Doraemon no Uta. One of my favorite version.
First used as Opening Song for Doraemon: Nobita and the Birth of Japan (1989). Then later used as Opening Song in Doraemon 1979 Anime (October 9, 1992 - September 20, 2002).
In the Movie, This version was used until the 25th Doraemon The Movie; Nobita in the Wan-Nyan Spacetime Odyseey (2004). The last Doraemon The Movie to be made using the original casts since 1979, As well as the last movie in the 1979 counterpart.
I have no idea why it took 3 years to make this version become an Opening Song for TV Anime.
I do not own the right of this song. This video is uploaded for entertainment purpose only.