The song "Không" (No) was first recorded by Khanh Ly on vinyl with the disc title "Tình ca quê hương" (Native land love songs). "Không" became one of the signature songs of Elvis Phuong's singing career, as well as some other Nguyen Anh 9's songs such as "Ai đưa em về" (Who takes you home), "Chia phôi" (Parting), "Một lời cuối cho em" (One last word for you)... many performed by Elvis Phuong on the stage of Queen Bee discothèque in Saigon in early 1970s.