John Legend surprised London commuters this morning when he played an impromptu concert at the St. Pancras train station. ET reports that the 38-year-old Grammy winner had just gotten off a train from Paris when he sat down at one of the station's public pianos to belt out hits like "All of Me" and "Ordinary People." A few moments before his performance, Legend tipped off fans by tweeting, "Arriving at London St. Pancras station on Eurostar. Do they still have that piano there?" On Monday, he announced on Twitter that he was "coming to Europe" for his Darkness and Light tour.