Agatha of the Elite Four

hey, So I am pretty good at sight singing melodies that are in a major/minor scale, but not so good when they are atonal and use 6ths and 7ths that are used chromatically. But I can't hear two voices in my head at once. How do you get this ability?

hey, here is the first piece i wrote four months ago. it's about a meadow; it was made in finale. unfortunately i don't have a pdf since i threw the score out because i decided i hated it, but now that i listen to it i think it is not so bad, so oh well. it starts out boring and then gets exiting and then gets in between. i have to admit i don't really have much enthusiasm for piano despite that i play most of the day, but i;m seriously thinking about just stopping because i like orchestra music way better. here's the file: 2shared - download MeadowlandPrelude.m4a

there are a few things i really want to know, like what is the best computer program for ear-training? also, what is the best way to train my ear to hear notes sounding simultaneously? also, how can i improve my memory? It seems like on dictation exercises i always forget it half the time, and if it is long, well then forget it. thanx