new singer
Refers to a singer who has recently debuted or is new to the music scene. Often used in entertainment news and talent show contexts.
That new singer became famous overnight with their debut song.
An audition to discover new singers will be held.
新人 is a general term for a newcomer or rookie in any field, while 新人歌手 specifically refers to a new singer.
歌手 means 'singer' in general, without the nuance of being new or recently debuted.
Compound of 新人 (newcomer) + 歌手 (singer).