I'm a writer and a musician.
Can I use 'a' only once before 'writer' in the above sentence? Or should it be written before both professions?
I'm a writer and musician.
How about omitting 'a'?
I'm writer and musician.
The second one can be omitted if the two are felt to be close together (a knife and fork, a table and chair). Do you have one job which combines being a writer and musician? Or do you sometimes work as a writer and sometimes as a musician? That's how to decide.