In 2003, Mr Powell - a cousin of the poet and author Benjamin Zephaniah - died after he was restrained by officers during an incident outside his home.
BBC: News - Today - Charity calls for inquiry into police custody deaths
"When it looks like the sun isn't going to shine anymore, God put a rainbow in the clouds, " sung the 74-year-old, hosted onto the stage by Rastafarian poet Benjamin Zephaniah.
BBC: Angelou's rainbow of poetry
Benjamin Zephaniah was the programme's guest-editor.
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