The song "I Ain't Got You" by John Mayall is about a man who has all the material possessions he could want, but is missing the one thing he truly desires - the love of his partner. He sings about his luxurious car, money, women, and alcohol, but none of these things bring him true happiness because he is lonely and missing the love of the person he cares about. He describes his frustration and desperation as he lists all the things he has in his life, but still can't find the one thing he truly needs - his partner's love. Despite his attempts to find happiness with other women and pleasures, he realizes that he will never truly be satisfied until he has their love. Overall, the song is a commentary on the importance of love and connection in our lives, and how material wealth and pleasures can never truly replace these things. It serves as a reminder to prioritize the people and relationships that matter most in our lives.