I shall contribute This (Brief Chart).
In my time as a Starseed and Contactee, i have encountered or observed (however briefly) a vast variation of galactic humans, from the nearly earthly (such as my own fellow Pleiadians, and others) who, with a change of clothes, documents and items, and a weekend crash course in language and culture, could (and are) walking around somewhere on the earth, as otherwise indistinguishable as any earthling of a given nation.
Conversely, i have also seen galactic people who have no inconspicuous place on earth, outside of sci-fi shows and conventions, and halloween night.
Also, music and spirituality is important to most galactic cultures. As such, Goa-trance and some forms of techno, especially when slowed down abit, are comparable to what we would consider 'Galactic Rock and Roll'.