December 7, 1968:  In week 13 on the Billboard album charts, In Search of the Lost Chord reached its peak position of 23


More album scans:  http://moodybluesattitude...-Lost-Chord#.Tt4XOPLnufQ

Magazine

Week #

Date

Chart Position

Comments

Billboard

1

Sep 14, 1968

122


Billboard

2

Sep 21, 1968

95


Billboard

3

Sep 28, 1968

62


Billboard

4

Oct 05, 1968

56


Billboard

5

Oct 12, 1968

39


Billboard

6

Oct 19, 1968

31


Billboard

7

Oct 26, 1968

29


Billboard

8

Nov 02, 1968

26


Billboard

9

Nov 09, 1968

29


Billboard

10

Nov 16, 1968

29


Billboard

11

Nov 23, 1968

28


Billboard

12

Nov 30, 1968

25


Billboard

13

Dec 07, 1968

23

peak position reached

Billboard

14

Dec 14, 1968

28


Billboard

15

Dec 21, 1968

32


Billboard

16

Dec 28, 1968

53


Billboard

17

Jan 04, 1969

66


Billboard

18

Jan 11, 1969

77


Billboard

19

Jan 18, 1969

92


Billboard

20

Jan 25, 1969

146


Billboard

21

Feb 01, 1969

146

dropped off chart temporarily after this week

Billboard

22

Jun 28, 1969

160

returned to chart

Billboard

23

Jul 05, 1969

149

certified platinum this week

Billboard

24

Jul 12, 1969

144


Billboard

25

Jul 19, 1969

144


Billboard

26

Jul 26, 1969

143


Billboard

27

Aug 02, 1969

146


Billboard

28

Aug 09, 1969

142


Billboard

29

Aug 16, 1969

153

last week on chart