Static Content is content that will likely not change very much from class to class. The general concepts covered will stay the same, as will the majority of materials used; however, some examples may vary from time to time.
These classes are relatively short sessions to disseminate a lot of information. With that in mind, it's important to craft an interesting topic, and include content that is specific enough to be covered in detail in that timeframe.
As an example, "Music Theory" is far too big of a topic to cover in 45 minutes. However, "Music Theory for Complete Beginners: The Basics" may be more digestible, accompanied by an explicit description of the basic elements covered in the class (whole/half steps, intervals, grand staff, clefs).
From there "Building on Music Theory Basics" could be a stand alone class for those with basic knowledge or a follow-on class for those who enjoyed the first (with topics that include quick review of intervals followed by note values, meter, and diatonicism vs chromaticism).
A third class may be "Practical Use of Music Theory Basics" (with quick review of intervals and diatonicism and then venture into building blocks of chords, tonic/dominant relationships using song examples).
Other ideas for static content classes include:
Guitar Anatomy for the Complete Beginner (tuning, string names, understanding the instrument).
Starting to Play Guitar - Quick Guide (3 or 4 open chords, simple strumming)
Techniques for Guitar Soloing (articulations, hammer-ons, pull-offs, bending, glissando, picking techniques, blues scale)
Basic Piano for the Complete Beginner (white/black keys, notes, understanding the instrument, etc).
Simple Piano Chords for Accompaniment (root, triads, easy arpeggios)
Songwriting: Writing Lyrics (form, meter, scheme, storytelling)
Songwriting: Creating Melodies
Songwriting: Popular Chord Progressions and Harmony
Introduction to GarageBand