Vocals for 1 song

Hello I really enjoy your work. I especially like your song Ghost Stories. What is the price for a singing hook? Thank you.

Additional info:
I don't have a hard deadline for this. I'm interested in hiring a pro who's worked on hit songs and have the budget for that. I'm looking for a male singer. The lyrics and melody are already written. I just need a singer.. . I'm an indie artist. I need just the hook or chorus recorded. The song will be released commercially. I'd like to use your name as the vocalist.