Final answer:
Kiss was the New York glam rock band that gained fame with the release of the live album 'Alive!' in 1975, following initial struggles.
Step-by-step explanation:
The glam rockers from New York who didn't initially see much success until the release of a live album in 1975 were Kiss. After forming in 1973, Kiss struggled to gain significant attention with their studio albums.
It wasn't until the release of Alive!, their live album in 1975, that they achieved commercial success.
This turning point was marked by their theatrical live performances and elaborate costumes and makeup, which became their signature style and helped establish their fame both nationally and internationally.