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Question: What is 6502?
Answer: 6502 is an 8-bit microprocessor, and these resources are for 6502 assembly language programming, the instructions that tell the processor what to do.

Question: Is this how NES games are made?
Answer: Yep! Now hurry up and learn it so you can make us all new games!

Brian Parker, aka BunnyBoy (he doesn't read IM's!), has been teaching 6502 in his forum-based column called "Nerdy Nights." Following suit, MetalSlime released several articles on using sound in 6502. Check them all out if you're wanting to learn 6502:

For beginners...
• Nerdy Nights: Intro by BunnyBoy
• Nerdy Nights: Week 1 - Number Systems and Core Programming Ideas by BunnyBoy
• Nerdy Nights: Week 2 - NES Architecture Overview by BunnyBoy
• Nerdy Nights: Week 3 - 6502 ASM, First App by BunnyBoy
• Nerdy Nights: Week 4 - Color Palettes, Sprites, Second App by BunnyBoy
• Nerdy Nights: Week 5 - Multiple Sprites, Reading Controllers, More Instructions by BunnyBoy
• Nerdy Nights: Week 6 - Backgrounds by BunnyBoy
• Nerdy Nights: Week 7 - Subroutines, Game Layout, Starting Pong by BunnyBoy

Sound...
• Nerdy Nights Sound: Intro - About the Nerdy Nights Sound series by MetalSlime
• Nerdy Nights Sound: Part 1 - Make a Music/SFX Engine by MetalSlime
• Nerdy Nights Sound: Part 2 - Square 2 and Triangle Basics by MetalSlime
• Nerdy Nights Sound: Part 3 - Periods and lookup tables by MetalSlime
• MetalSlime's Development Blog (offsite)

For Advanced users...
• Advanced Nerdy Nights #1 - CHR Bank switching by BunnyBoy

Misc...
• Nerdy Nights: Hex Editing - Alter Your Own Title Screens! by BunnyBoy