And some are more challenging than others. For example, this standard by Joe Zawinul who'd already had his instrumental Mercy, Mercy, Mercy turned into a hit song in the late 1960s:el-bo (formerly ebow) wrote:rp314 wrote:3. Some instrumentals, certain Duke Ellington works come to mind, were originally given a name and when they appeared to have potential as songs some poor soul(s) had to write lyrics that fit the arbitrarily chosen title that by then had become too popular to be changed.
I'll let those who enjoy such things check out the Manhattan Transfer version (the lyrics of which were written by Jon Hendricks who made a practice of such things) on your own.