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#!/usr/bin/perl

...
close (FH) or die "Can not close file: $source: $!\n";

$| = 1; #flushing output

perl mp3.pl song.mp3

Use of uninitialized value $memory[0] in bitwise and (&) at Exercise_3
+.pl line 143.
Use of uninitialized value $memory[1] in bitwise and (&) at Exercise_3
+.pl line 143.
Use of uninitialized value $memory[2] in bitwise and (&) at Exercise_3
+.pl line 143.
Use of uninitialized value $memory[3] in bitwise and (&) at Exercise_3
+.pl line 143.

exit(0);

print("This is the frame_id: $frame_id\n");

This is the frame_id: TPE1

I have found one matching pattern: TPE1