In August Bob Harris celebrated his 40th anniversary on BBC Radio.
To mark the occasion, Bob spoke to his friend Robert Plant about their first meetings in the UK, extraordinary tours with Led Zeppelin across America and their subsequent journeys, as broadcaster and musician respectively, through some extraordinary musical genres.
They also talked about Robert's preparations for his most recent album and tour with the latest incarnation of his Band of Joy, culminating in the amazingly eclectic Radio 2 Electric Proms at the Roundhouse at the end of October.
Here's another chance to hear their conversation.
Another chance to hear Bob's 40th Anniversary interview with his friend Robert Plant.