There! I confess! I envy people that know how to create SID tunes. Besides the lack of musical inclination, I see tracking software one of the most daunting things to learn in the C64 scene. There are many great tools that try to make it easier for the musicians out there. One that is available to run on modern Windows machines is Music Studio, which reaches version 2.2.
Music Studio 2.2 is a Windows-based SID music creator software. For an accurate C64 sound, it utilises the newest RESID-FP emulation available, both old (6581) and new (8580) SID chips.
MS2 is capable of creating 1x speed tunes and alternate many SID chip parameters directly with various commands. Classic and new C64 sounds can be created with envelope parameters that can be set up in few simple steps.
The software is available for free, and also in source code form on Github.