Headcrab Canisters Attack!

I was wondering if anyone could make a script for me that makes it so headcrab canisters land into the map (about 10 of them) in the map rp_oviscity_gmc4. When the headcrab canisters land about 3 headcrabs come out of each then the song The Night by disturbed comes on and then the map gets really foggy. You know it would be awesome. :buddy:

I would also like this to happen at random times at least every 2-4 hours or just make a command to change the times.