Music
Vocalise, No. 14 of 14 Romances, Op. 34. by Sergei Rachmaninoff(1 April 1873 – 28 March 1943)


The Song / Music
Sergei Rachmaninoff composed 14 Songs (or 14 Romances, Op. 34) in 1912, with the famous final song added later in 1915. It contains no words and is sung on a single vowel.
Although the original publication stipulates that the song may be sung by either soprano or tenor voice, it is usually performed by a soprano. And it is often played as an instrumental piece by orchestras or solo instruments like the cello or violin instead of being sung.