This is a program that can playback .SID files found in the HVSC collection (http://hvsc.c64.org/) on a real Commodore 64/128. Make sure you have the most recent HVSC version for your sid files. It was designed for both PAL and NTSC computers, and will play all sid songs at correct system speed.

In the zip file there are docs and several versions of the program for various storage types such as sd2iec, 1541 ultimate, IDE64, etc...