Is it possible that a Program compare the output of the Music and report back that some music is simlar? and possibly the same music? ( To find duplicated music. )

Yes, it's possible, but it's not easy (at least if you want good accuracy).

IIRC, Fraunhofer is working on stuff that will allow this (in general, not so much with the application you have in mind). I don't know the actual extent of its classification abilities though.

So really there are no easy way to find duplicate music.

Some ripping can have +/- 1 or 2 sec sliences.... And there are many that i rip which are duplicate over many CDs..........

opps......... i forgot i could search for similar names........ "

You could check MusicBrainz

J.River Media Center have a similar Function to compare Audiotracks, it ist called YADB. Try it out.

What about the mobile service that I've seen advertized on TV?
You call a number, hold the mobile up to the music and it'll record part of the song, search a DB and return you with the title of the song.
Isn't this exactly the same function that iwod was asking about?

If you have to wavs which only differ at the beginning or at the end
then you can use EAC's built-in wav-compare tool. It should tell you
whic one has missing samples.