My website has no background music. I have this big wav i'd like to use but it eats into my bandwidth..can i convert it to mIDI Synth..so it's not so big?

Check out http://www.hitsquad.com/smm/news/867/ One page I copied from states this, and why its difficult to actually go about doing that. A MIDI file is a sequence of commands to control one or more pieces of equipment (synthesizers most of the time). These commands are not sounds, they are recorded operations to do something (mostly to generate sound). A WAV file is sound. It is the recording of a sound wave. It is the mix of all the given things (instruments, voices, background noises) you could have heard at the moment of recording. A lot of info (in fact most of it), that you need for a MIDI file, is lost. Like with the cake. When the cake is at your table, all data about the baking process is gone.