 
<translate> "Knockin 'on Heaven's Door" wani waka ne da Bob Dylan ya rubuta kuma ya rera, don waƙar fim din 1973 Pat Garrett da Billy the Kid. An sake shi a matsayin guda ɗaya, ya kai lamba 12 a kan Billboard Hot 100 singles chart. Wanda marubucin tarihin Dylan Clinton Heylin ya bayyana a matsayin "aikin motsa jiki a cikin kyakkyawan sauki", waƙar, an auna ta ne kawai dangane da yawan sauran masu zane-zane da suka sake ta, yana ɗaya daga cikin shahararrun waƙoƙin Dylan bayan shekarun 1960.  Tambaya: wanene ya rubuta waƙar buga ƙofar sama? Ruwa na sani a kasa: <eng> Context: "Knockin' on Heaven's Door" is a song written and sung by Bob Dylan, for the soundtrack of the 1973 film Pat Garrett and Billy the Kid. Released as a single, it reached No. 12 on the Billboard Hot 100 singles chart. Described by Dylan biographer Clinton Heylin as "an exercise in splendid simplicity," the song, measured simply in terms of the number of other artists who have covered it, is one of Dylan's most popular post-1960s compositions.

Question: who wrote the song knocking on heaven's door?
Steam of consciousness below:
 