How to add custom sounds in a resource pack? [duplicate]

I have been playing Minecraft for over 2 years, and I wanted to get into making resource packs. I understand how to change textures, but I wanted to change the sounds. I know how to access the 1.8 sound files, and was wondering if there is an easier way to change the sounds in 1.8. I have been using: .minecraft/assets/indexes/1.8.json and then going to: .minecraft/assets/objects/## to change the sounds.