The cover version of 'Prodigal Son' has the line 'My son was lost but now he is found'. This could apply to the Stones' music after the patchy 'Their Satanic Majesties Request' LP from 1967. Between that and 'Beggars Banquet' of the following year Jagger read a book, Richards got a free guitar lesson and Nicky Hopkins became the 'fifth' Stone providing soul and counter-point on piano. This release anticipates the next three studio albums 'Let it Bleed, 'Sticky Fingers' and 'Exile on Main Street'. It still sounds fresh, dangerous and rude yet at the same time the most emotional of all the Stones' albums. 9 out of 10