Space Craft’s latest players are The Weather Machine and The Mondegreens, two folk-rooted rock groups that take the stage on Saturday, Dec. 3.

The Weather Machine’s sophomore full-length, “Peach,” was recorded over the course of two years and showcases the band’s transition from folk-born storytelling into the realm of power ballads and effects pedals.

It’s not quite tongue-in-cheek, but Peach makes the listener wonder as it pits a not-quite-country anthem called “Wannabe Cowboys” right up against the electronic slow-jam title track, then moves deftly along into “Breakup Song,” a tune worthy of high-kicking chorus lines.

The Weather Machine has drawn comparisons to everything from My Morning Jacket to Cake. The Portland band has toured with the Alabama Shakes and Cold War Kids.

The Mondegreens, with its rotating tunester trio, churns out a new take on “California Soul.” With an infectious, harmony-driven sound that combines the raw passion of Elliott Smith with the diverse soundscapes of Grizzly Bear, their sought-after live shows can “run from dusty, shambling Americana to bright and modern in a single set” and are as likely to feature a tune from Neil Young’s back catalog, as an anthem from their adolescence that came decades later.

The show begins at 8 p.m. at Rolling Bay Hall. Tickets, $12 in advance, can be purchased online at www.spacecraftpresents.org.