How many albums did Led Zeppelin release before 1970?
2
3
3
3
4
3
4
3
2
5
4
3
2
5
4
3
2
5
4
3
1
2
5
4
3
1
2
5
4
3
1
2
5
4
3
1
2
5
4
3
1
2
5
4
3
1
2
5
6
4
3
1
2
5
6
4
3
1
2
0
7
5
6
4
3
1
2
7
5
6
4
0
3
1
2
7
5
6
4
3
0
1
2
7
5
6
4
3
1
2
0
7
5
6
4
3
1
2
7
5
6
4
0
8
1
2
7
5
6
4
8
0
1
2
7
5
6
4
8
1
2
0
7
9
5
6
11
8
1
2
7
9
5
6
0
11
8
1
7
9
6
10
11
13
12
8
0
1
7
9
6
10
11
13
12
8
1
7
9
6
10
11
13
12
8
7
9
6
10
11
13
12
8
7
9
6
10
11
13
12
8
7
14
9
6
10
11
13
12
8
7
14
9
6
10
11
66
62
112
66
62