Presumably a collected piece of social dance music. Larvik is a city in southern Norway. The design of this polka is the very common ABACA of social dance music, beginning with contredanses in the late 1700s and then spreading to almost all other types. The ABACA can be almost indistinguishable from a small ternary form (ABA) with trio (C) and truncated reprise (A), though the "trio" is only one strain, not the two we usually find in the familiar Classical instrumental repertoire of sonatas, etc. The equally common case used here has A as a single principal strain, B a first "trio" in the subdominant key, and C a second trio in the relative minor. (In the contredanse repertoire C is almost always in the parallel or relative minor, which fact might suggest that Larvikspolka is a traditional tune, not a newly composed one from the 1850s). The modern notation is by "Sigerland" and is available on IMSLP:
link.
I hear a primitive rising line in A:
In the first iteration of A, however, an inner voice is pushed above (F4 to F5) and the unfolded B4-F5 closes into C5-E5--see below. We can then trace the voices in the two trios. The C5-E5 interval remains stable in the first trio B, except that E5 moves up to F5. In the second trio C, G4 becomes A4/A5 and C5 remains stable.
A synoptic view, then, is as follows:
Note: I have "collapsed" two aspects into one, as the line ^5-^7-^8 is easily understood based on the proto-background ^5-^8.
