From the best of dark horse: 1976-89 album, was released as a promo single for the album itself in november of 1989, and also has the george harrison/jeff lynne sound to it, musically speaking, featuring slide guitar and baritone sax.

Cheer Down

Explanation:

             Cheer Down was first released in the year 1989. It was a musical song written by George Harrison. George Harrison was international musician, music composer and the lead guitarist in "The Beatles".

           This piece of soundtrack was contributed to the film "Lethal Weapon 2". Harrison along with Jeff Lynne produce the 'Cheer Down'. It was a single track in thecollection of "Best of Dark Horse" album by George Harrison.

Hence the answer is --

"Cheer Down"

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