Some of Tchaikovsky 's friends , such as Nikolai Rubinstein , advised him against the marriage .
Being the husband of a foreign singing celebrity would mean Tchaikovsky would have to forgo Tchaikovsky 's own musical career .
Some of Tchaikovsky 's friends , such as Nikolai Rubinstein , advised him against the marriage because being the husband of a foreign singing celebrity would mean he would have to forgo his own musical career .