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