Jump at the Sun is a spooky minor jig composed by John Kirkpatrick. I believe our version is from the Portland One book.

Here is a video of the composer performing it on accordian. It's the second tune in the medley:

https://www.youtube.com/watch?v=Ua3JRyqtlQE

And I love the arrangement and instrumentation in this version by the band King Alfred's Cakes. Cello and flute plus more!

https://www.youtube.com/watch?v=8pWAK5Z6_ho