All tunes to reach the top in 1968. An asterisk * next to an artist’s name means said artist is Canadian.
Previous polls-
1964:http://boards.straightdope.com/sdmb/showthread.php?t=767524
1965:http://boards.straightdope.com/sdmb/showthread.php?t=767714
1966:http://boards.straightdope.com/sdmb/showthread.php?t=767890
1967:http://boards.straightdope.com/sdmb/showthread.php?t=768306
Vote for as many as you like.