In the 1970s a lot of things changed, and many new genres and subgenres emerged, the most important ones being
- various rock derivatives (such as hard rock, heavy metal, progressive rock, and glam rock for example),
- electronic music (partly the result of the continued development of synthesizers),
- punk, and
- disco (which became very important in the mid-to-late 1970s).
The 70s were innovative and experimental, which led to a wider diversification of music.
If you ask critics, then this decade can be considered to have been almost as great as the 1960s, while it still was very different from the point of view of its sound.