Utterances phrases, doubts about what to cover


Greetings, i have a doubt about utterances phrases. Should one aim for gramatically correct phrases or as much phrases as possible ignoring if they are gramatically correct in order to cover as much possibilities of user invocation phrases?.

For example, if an utterance is:
“i want to hear a song”
Should i include “i want to hear a song please” and “please i want to hear a song”? Even if the latter is not the “usual” way to say that phrase (keep in mind that english is not my native language, maybe that is a very common way to ask for a song and i dont know).

Thanks for your help.