the early first decade of the 21st century was dominated by post-grunge and continued to see the expansion of alternative rock, pop-punk, hard rock, and indie rock both artistically and commercially. the main musical phenomenon was the emergence of a new generation of singer songwriters that were the direct consequence of the previous generation's intellectual ambitions. the biggest factor that has contributed to the resurgence of rock music in the first decade of the 21st century is the rise of paid digital downloads. the vast majority of songs bought on paid download sites are singles bought from full albums; songs that are bought on a song-by-song basis off artist's albums are considered sales of singles, even though they have no official single for purchase. the boom of independent music at the turn of the millennium changed the dynamics of the music industry. at about the same time, the cd (cheap to manufacture) replaced the vinyl album and cassette tapes (expensive to manufacture). shortly thereafter, the internet allowed musicians to directly distribute their music, thus bypassing the selection of the old-fashioned "record label". canada's music industry has suffered as a result of the challenging times for the better part of the last decade. canada joined 50 other nations in 2008 to update its copyright act, and in doing so aimed to allow artists and others to seek compensation for their work, no matter how it is distributed. in 2010 canada introduced new copyright legislation. the amended law makes hacking digital locks illegal, but enshrine into law the ability of purchasers to record and copy music from a cd to portable devices.