Through semantic widening, a broader sense of the word song may refer to instrumentals.
An instrumental can exist in music notation, after it is written by a composer; in the mind of the composer (especially in cases where the composer themselves will perform the piece, as in the case of a blues solo guitarist or a folk music fiddle player); as a piece that is performed live by a single instrumentalist or a musical ensemble, which could range in components from a duo or trio to a large big band, concert band or orchestra.
Some recordings which include brief or non-musical use of the human voice are typically considered instrumentals.
Examples include songs with the following: Songs including actual musical—rhythmic, melodic, and lyrical—vocals might still be categorized as instrumentals if the vocals appear only as a short part of an extended piece (e.g., "Unchained Melody" (Les Baxter), "Batman Theme", "TSOP (The Sound of Philadelphia)", "Pick Up the Pieces", "The Hustle", "Fly, Robin, Fly", "Get Up and Boogie", "Do It Any Way You Wanna", and "Gonna Fly Now"), though this definition is loose and subjective.
"Better Off Alone", which began as an instrumental by DJ Jurgen, had vocals by Judith Pronk, who would become a seminal part of Alice Deejay, added in later releases of the track.