The Ramsey Lewis Trio's recording of Travel On predates The "In" Crowd, the 1965 hit that brought the group international fame in 1965, by at least a year. Travel On was included on the trio's 1964 album Bach to the Blues and was released as a Chess single in the U.S. that year, with Why Don't You Do Right as the flip side.
When The "In" Crowd single came out the following year most territories used Since I Fell for You, another track off The "In" Crowd LP, as the "B" side. But for some reason Artone, the label that released the 45 in The Netherlands, opted to use the earlier recorded Travel On. The Dutch single also featured the striking picture sleeve shown at the top of this post. Listen to Travel On below.
Travel On was included on a vinyl compilation, Choice! The Best of the Ramsey Lewis Trio, which came out in 1965, but does not seem to have been included on any CDs nor does it appear to be available as a legal download.
Here's the original recording of The "In" Crowd, the single version, with some definitely unique visuals.