Most of the others involve singing, where #4 is the most instrumental. If you want more instrumental, or "jazzy" try #14, although it's not the same as #4. If you want a "similar feel," try many of the others - #3, 8, 10 are all very nice, and of course the new #20 with the Either/Orchestra has instrumental passages. #13 is also supposed to be great, but I haven't given it a proper listen.
I love how this series keeps getting discovered.