1. You want to start a texture pack. (If not already started)

2.Do as I tell you. Go find your resource pack were ever it is-> Go into assets-> Go into minecraft-> Make a folder in there called sounds-> Go into that and make a folder called records and copy the "records" from your regular minecraft pack.

3. Go to mp3skull.com and find songs and download them.

4. When you have the 12 you want go to media.io

5. now upload 1 by 1 and make it .ogg and select regular after that then upload then download.

6. Move all the songs you just changed to .ogg in the records folder.

7. Rename the song to the record you want it to sound like. EX: Fishin in the dark. I want 11.ogg

8. I would delete 11.ogg and rename fishin in the dark.ogg to 11.ogg.

9. Test it out!

Thanks!

Credit: Waldder_2002 for mp3skull.com.