Let 'Em In by Paul McCartney is a cheerful and welcoming song that emphasizes opening one's doors, both literally and metaphorically, to friends and family. Through simple yet catchy lyrics, McCartney invites a variety of guests, including familiar names from his own life, to come in and join the gathering. The song conveys themes of hospitality, inclusiveness, and the joy of having loved ones around. Its poignant moments revolve around the repetitive chorus and the call-outs to specific individuals, creating a sense of warmth and community.