Mixing & Mastering for 3 Short Vocal

I need professional mixing and mastering to blend three amateur vocal recordings with a karaoke/instrumental track so they sound natural and cohesive.
The goal is to avoid the “separated / pasted-on” feeling I get when I try mixing myself.

Scope of work
**Produce 3 separate final versions (one per singer):
-Version 1: under 2 minutes
-Version 2: under 1 minute
-Version 3: under 1 minute

**Ensure a clean and natural mix so vocals blend smoothly with the instrumental (using EQ, compression, reverb, pitch correction if needed).
**Deliver in WAV and MP3 formats.


***Important Requirement (Before Hiring)
Any freelancer who wants to take this job must first provide a short 15–30 sec mock-up mix using the attached vocal sample (30 sec) together with the full instrumental track.
This mock-up is required to evaluate how well you can blend the vocals with the instrumental.
Only freelancers who provide a mock-up will be considered for the final project.