Well, it’s called like that because one of the major trends of the 70s music was the exposing of a new generation of youthful people to new media, hence newer ideas in almost any field of entertainment.
The 70s music is characterized by the emergence of many genres, including jazz-rock fusion, reggae, hip-hop. It also points the rise of experimental classical and minimalist music by classical composers. In the rest, it’s just the usual funk, disco, art rock, progressive rock, glam rock and punk music. If I just quote some of the most popular 70s bands, you’ll get the idea: Aerosmith, The Ramones, Bruce Springsteen, Pink Floyd, The Sex Pistols, Kiss, Led Zeppelin and, of course, The Beatles.
Karaoke parties are always appropriate and the 70s music is absolutely brilliant! I think this party is a great idea if you pick some of the best, beat wise pieces of the 70s music.