The site American Passages: A Literary Survey, includes brief background on Alan Ginsburg. Open up the Author Questions on the page and refer to questions two and four to spark analytical thinking about To Aunt Rose and Supermarket.
Alan Ginsburg reads his poem, A Supermarket in California, in the following video.
Starting at approximately 3:23 in this video is a thoughtful, thorough discussion of the poem’s context, form, meter, and themes: Litpoetry: A Supermarket in California by Allen Ginsberg.
This video offers Ginsburg reading Sunflower Sutra.