AP

People gather around a piano used by John Lennon to write the song 'Imagine' after it was uncovered for a photo shoot in Dealey Plaza

DALLAS -- Some people marked today's anniversary of the 1963 assassination of President Kennedy in Dallas by visiting the place where investigators say the bullet was fired.

Hundreds of people stopped at the Sixth Floor Museum to check out exhibits and artifacts on the 43rd anniversary of the slaying.

Investigators say Lee Harvey Oswald was at a sixth-floor window of what was then the Texas School Book Depository building when he fired the shots that killed Kennedy.

Texas Governor John Connally was wounded.

Also -- at nearby Dealey Plaza -- was the piano on which John Lennon composed the 1970s peace anthem "Imagine." The piano was placed in a grassy area for a photo shoot, to be part of an exhibit celebrating peace.

The piano is owned by British pop singer George Michael and was shipped to Goss Gallery in Dallas for a display, which will include the work of three war photographers. The gallery is owned by Michael's long-time partner, Kenny Goss.