I'm seeking vocalists to sell my sample packs

NOTE(Added in Sep 6): I am very grateful to have received messages from so many people. I’ll be closing the pitch for the time being.
As I’m currently contact with nearly 10 vocalists simultaneously, I would be most grateful if you could wait a little longer.

About
I am a music producer from Japan, planning to release sample packs focused on vocal chops.
I am looking for vocalists of any gender to record acappella vocal material for these packs.

Needed
The work involves singing short acappella vocal tracks, which I will later process and edit.
Professional-level singing is not required—basic singing skills are sufficient.
You are free to create original melodies and lyrics, or use AI-assisted ideas.

Recordings should be clean, with minimal room reverb and background noise.
Some minor background noise is acceptable and can be handled in post-processing.

Native-level proficiency in American or British English is required.
Recordings must be delivered as 48,000Hz, 24-bit mono WAV files.
Kind and clear communication is appreciated, as I am not a native English speaker.

Payment and Rights
Payment is generally $5 per 4-bar acappella vocal track.
Example: 10 × 4-bar tracks = $50
Example: 1 × 16-bar track = $20

All recordings will be transferred to me with exclusive commercial rights upon payment.
Optional credits on the sales page are possible.

Contact
If you are interested, please contact me to discuss how many 4-bar acappella tracks you can provide.
I will then inform you of the number of sections and the tempo I would like you to sing.

Please note that I can currently assign work to only one freelancer at a time, and even after acceptance, it may take some time before work begins.
The maximum payment I can provide for a single assignment is $60.

Budget range:
Simple project

Examples:
Post Processed Example

Before Processed Example

I’m seeking powerful vocalists for dance music.
Male, female, or other genders are welcome.

About the client
Japanese Music Producer