<Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (September 2009) (Learn how and when to remove this template message) </Td> </Tr> <Dl> <Dd> For music from a year in the 1970s, go to 70 71 72 73 74 75 76 77 78 79 </Dd> </Dl> <Dd> For music from a year in the 1970s, go to 70 71 72 73 74 75 76 77 78 79 </Dd> <Table> <Tr> <Th> Popular music </Th> </Tr> <Tr> <Td> </Td> </Tr> <Tr> <Th> Timeline of musical events </Th> </Tr> <Tr> <Td> <Ul> <Li> 2020s </Li> <Li> 2010s </Li> <Li> 2000s </Li> <Li> 1990s </Li> <Li> 1980s </Li> <Li> 1970s </Li> <Li> 1960s </Li> <Li> 1950s </Li> <Li> 1940s </Li> <Li> 1930s </Li> <Li> 1920s </Li> <Li> 1910s </Li> <Li> 1900s </Li> <Li> 1890s </Li> <Li> 1880s </Li> <Li> 1870s </Li> <Li> 1860s </Li> <Li> 1850s </Li> <Li> 1840s </Li> <Li> 1830s </Li> <Li> 1820s </Li> <Li> 1810s </Li> <Li> 1800s </Li> <Li> 1790s </Li> <Li> 1780s </Li> <Li> 1770s </Li> <Li> 1760s </Li> <Li> 1750s </Li> <Li> 1740s </Li> <Li> 1730s </Li> <Li> 1720s </Li> <Li> 1710s </Li> <Li> 1700s </Li> <Li> 1690s </Li> <Li> 1680s </Li> <Li> 1670s </Li> <Li> 1660s </Li> <Li> 1650s </Li> <Li> 1640s </Li> <Li> 1630s </Li> <Li> 1620s </Li> <Li> 1610s </Li> <Li> 1600s </Li> <Li> 1590s </Li> <Li> 1580s </Li> <Li> 1570s </Li> <Li> 1560s </Li> <Li> 1550s </Li> <Li> 1540s </Li> <Li> 1530s </Li> <Li> 1520s </Li> <Li> 1510s </Li> <Li> 1500s </Li> <Li> 1490s </Li> <Li> Early history </Li> </Ul> </Td> </Tr> <Tr> <Th> List of popular music genres </Th> </Tr> <Tr> <Td> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> </Td> </Tr> </Table>

Name and describe two popular styles of music that have developed since the 1970s