Besides the more mainstream things listed by Rivaldo,
1978 - Kate Bush debuted with Wuthering Heights
1979 - The Clash released London Calling
1978 - Siouxsie and the Banshee’s debut album The Scream released
1978 - Roxy Music reformed and released Manifesto
1979 - Joy Division released their debut album
Those 3 years were the foundation of the post-punk, new wave, and dark wave movements, and produced some of the most influential artists and music of the modern era, IMHO.