This program can compare and find similar (duplicates) of musical files (MP3, WMA, ASF, WAV). The analysis is made on contents of a file, it is necessary to note that similarity of a sound part is checked, using various algorithms FFT, Wavelet, math statistics, i.e. any bit-by-bit comparison is not made, therefore it is necessary for program to decode a musical file. Also the program can compare values of ID3, ASF tags and names of files.