A few days back SF Signal asked a number of SF authors - including me - for their definition of 'What is SF?' The result can be viewed here. I thought about this for a while and decided - as is my wont - to come up with something a little different.
So, here's my definition:
Thinking musically, science fiction is what you get when fiction goes electric. You plug ideas into an effects box and play with all the settings - adding distortion, harmonics, sustain, feedback and maybe a little echo. Then you turn all the amplifiers up to eleven.