Bridge Over Troubled Water by Simon And Garfunkel topped the chart for 13 weeks from February 21st. The album had 5 seperate periods at number 1 in 1970 - a total of 24 weeks. It stayed on the chart for 307 weeks - almost 6 years.
The Saturday Night Fever Soundtrack, reached number 1 on May 6th 1978 for 18 weeks and charted for 65 weeks.
Singles 1969-73 by The Carpenters reached number 1 for the first time on February 2nd 1974, spending a total of 16 weeks at the top of the chart in the year. It stayed on the chart for 125 weeks.
The Original Soundtrack of Grease, charted for 47 weeks and reached number 1 on October 7th for 13 weeks.
The Beach Boys' 20 Golden Greats topped the chart for 10 weeks from July 24th, staying on the chart for 86.
Abba's Arrival reached number 1 on January 15th for a week and charted for 92 weeks. It returned to number 1 on April 16th for 9 weeks.