The best-selling album released in 1978 is soundtrack GREASE which sold 25,000,000 copies.
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3

Sales: 17,000,000
Rankings:
4

Sales: 15,000,000
Rankings:
5

Sales: 15,000,000
Rankings:
6

Sales: 14,000,000
Rankings:
10

Sales: 7,205,000
Rankings:
11

Sales: 6,515,000
Rankings:
13

Sales: 6,315,000
Rankings:
14

Sales: 5,790,000
Rankings:
15

Sales: 5,655,000
Rankings:
16

Sales: 5,626,810
Rankings:
17

18

Sales: 4,100,000
Rankings:
19

Sales: 3,654,470
Rankings:
20

Sales: 3,497,046
Rankings:
21

Sales: 3,120,130
Rankings:
22

23

Sales: 3,100,000
Rankings:
26

Sales: 2,315,000
Rankings:
27

Sales: 2,309,380
Rankings:
28

29

Sales: 2,200,000
Rankings:
30

Sales: 2,180,000
Rankings:
31

Sales: 2,103,020
Rankings:
32

Sales: 2,100,000
Rankings:
33

Sales: 2,088,000
Rankings:
34

Sales: 2,050,000
Rankings:
35

Sales: 2,000,000
Rankings:
36

Sales: 2,000,000
Rankings:
37

Sales: 1,985,000
Rankings:
38

Sales: 1,899,080
Rankings:
41

Sales: 1,636,000
Rankings:
42

Sales: 1,566,000
Rankings:
43

Sales: 1,556,200
Rankings:
44

Sales: 1,550,000
Rankings:
45

Sales: 1,500,000
Rankings:
46

Sales: 1,452,770
Rankings:
47

Sales: 1,423,430
Rankings:
48

Sales: 1,407,500
Rankings:
50

Sales: 1,326,000
Rankings: