.FYI . Folks, a WAV file is the actual (originally analog) music which has been (recorded) digitized and formatted as a computer file. It is generally the best quality sound you can get on a computer, which is why even short WAV files are quite large. . MIDI is NOT a "compressed format" like MP3 is. It is easy to convert WAV<->MP3. MP3 works by deleting so-called "redundant" frequencies, usually in the mid-range. For rock music it doesn't matter, for fine jazz and classical MP3 sux. Converting WAV to MP3 you will lose some fidelity; you can NOT then convert MP3 back to WAV and "re-gain" the lost fidelity - it is gone. . MIDI is actually a set of instructions, a program, that your audio card and software reads and uses to actually generate the music on the fly. MIDI files can be quite small, only a few Kb, yet play long music stretches. Think of MIDI as that ticker-tape thing with holes punched in it that a toy musical instrument or even a piano could "read" and then play the music. [I may be the only one here old enuf to know about those <g>]. Generally, you can NOT directly convert a WAV, MP3 or other music file into MIDI. Some software "kinda" can do it, but quality is generally not good. MIDI can easily be converted to WAV, MP3 or other formats and saved as such. I have software for that - it is readily available. .