The Silverbeets are a band from Hobart, Tasmania.
Working mainly in the genre of indie/alternative rock, I get a strong sense of nostalgia in listening. The title of "We've Got a Groovy Thing Goin' " indicates that it may be intentional.
I can't swear that there's a Theremin in the accompaniment for "Does Not Equal Ten"; it's more likely that there isn't. There is still a rather experimental sound to it, summoning up how we looked to the future in the past. I think The Byrds would like what The Silverbeets are doing.
I am interested in the kind of New Age elements of "Passenger Side". About half of the songs are more that way, with the other half being more groovy. There are some thoughtful lyrics.
The Silverbeets do not appear to have their own Youtube channel at this time, but you can find a couple of performances by searching on their name.