We're the only singers still performing in the same way as 100 years ago, without amplification or technology.
She became the first and only singer to be put under personal contract with the songwriters.
She was the only singer to get maximum number of votes from the public in that show.
Sara was not the only professional singer in the family.
But it's not like she's the only singer in the world; anybody with a strong, powerful voice could have done it.
He is the only French singer to have sold over 300 million records.
This made her the only Taiwanese singer to grace the cover of the magazine to date.
She wasn't the only singer who was hooked on drugs!
He knew that she was probably the only singer who could technically handle the difficult works Petiron wrote.
She is the only singer to have won this Grammy three consecutive albums.