Go on minecraftforum.com and download it from there.
darude - sandstorm
all of them if it is not bugged up too much
Mods (modifications) are free. You do not need to pay, however, you do need to be able to download them. Use Magic Launcher or Forge to do this.
versions -> 1.6.1 -> 1.6.1 -> 1.6.1.jar -> there you put your files
You can still add mods using a different launcher through Demo/Single player you just can't join multiplayer servers. You have to purchase a premium account for that.
If you use the Technic Launcher to launch Minecraft, it will automatically update the mods that it supports (with Hack Slash Mine being one of them). You can download the Technic Launcher when you use the link.
Yes it works great
Yes, But you would need 1. A lot of time and 2. To know which mods are in voltz and to download them seperately
When you first open launcher, click options and click "force update". This will work when updating to any version. Be warned if you have any mods they will be deleted.
All Minecraft mods are free, since they aren't made by Mojang. You can find tons of mods on the Minecraft Forums, just type it in Google and you'll find it. However, if you mean by 'easy-to-install' Minecraft mods, modpacks like the Yogbox come with a launcher that'll install all the files for you. Deep Space Turtle Chase, a custom map, installs the files automatically as well.
Go to Start -> Run -> type %appdata% Delete the folder titled: .minecraft Go to wherever you keep the Minecraft launcher (The icon is the block of dirt) and run it! It will re-download the files, fresh and new. [Beware though; deleting the .minecraft folder will REMOVE all your worlds, servers, texture packs, screenshots, mods etc.]
It is impossible to obtain the "MobSpawner" block without the use of mods or inventory editors.