Galveston is one of Jimmy Webb's masterpieces, arranged and recorded by Glen Campbell, which turned into one of Glen's biggest hits in 1969. It is written from the point of view of a soldier longing to be back home rather than anywhere else in the world, let alone at war. Glen's upbeat treatment of the melancholy theme is quite a contrast to the way Jimmy envisioned it, and recorded it years later.
The song is in the key of F, uses lots of chords (including many from other keys), and has unusual harmonic phrasing as well. This adds up to a lot of barre chords, along with some advanced chord shapes and changes.
The lesson covers the way Glen plays it in F, as well as an easier way to play it in D (which can be capoed to the third fret to be in F, of course).