A karaoke microphone is never compatible to a computer.
Yes you can on Singsnap its a free Karaoke site .
You have to have some kind of software to operate a computer. For a computer to even know what to do when you power it on, there is software stored on a chip on the motherboard, called the bios. This...
No.
you can...many karaoke shows are now run off a computer...you do need the correct software to read a .cdg file (RoxBox karaoke software is one player)