In the plural, it's solos.
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A solo song or acapella
it was not sung by him it was sung by Micheal Jackson and you can find it on lyrics.com
A song sung by only one singer, with or without instrumental accompaniment, is called a solo. A song sung by one or more singers without instrumental accompaniment is called a cappella.
The song that finishes "you'll never walk alone cause you're everywhere to me" is a song called Everywhere. It is sung by Michelle Branch.
SOLOS