I haven't figured out how to change the name of the songs in game.

Step:1 Grand Theft Auto V\x64\audio\sfx\RADIO_08_MEXICAN and replace mex_final_mix_32.awc by selecting new and import openformats

Step:2 Grand Theft Auto V\update\update.rpf\x64\patch\data\cdimages\scaleform_generic.rpf\ and place the hud.ytd into that folder.