hi,
first of all please write your post with normal font and with better spelling, please.
to load your file into MATLAB you have to put the file into your MATLAB project folder. for example mine is: C:\Users\username\Documents\MATLAB. Idon't mean where matlab is , I mean the project folder where your .m files etc go. then you can drag and drop the file you need from your current directory to your command window. this will bring an import dialogue, if you say ok, the file will be appear as a matrix on your workspace.
second, you can use the fft functiopn to take the fft of your matrix. for example: if you have your music in aa, a_t = fft(aa); will give you the transform of your music.
third: for example if you want to modify the amplitudes of your transform signal, you can do this by scalar matrix multiplication. for axample say your fft a_t is a matrix with length 10 000. this will mean that the value in 200 is the value of 200 Hz. so you can multiply the transform from 200 HZ to 500HZ with 5 this way: a2_t = 2*
,200:500);
the rest is like that. there might be problems with the sample codes, but you can check them on the internet or find how to do them right.
second