Their sound incorporates personal and social themes along with stripped-down music that was influenced by punk and the free-thinking ideals of 1980s-1990s alternative and indie rock. They experimented with this foundation by bringing in different instruments and arrangements. Sleater-Kinney have been compared to female singers such as Siouxsie Sioux of Siouxsie and the Banshees,</ref> Patti Smith and Poly Styrene of X-Ray Spex. They have also named influences such as Bikini Kill, Mecca Normal, Bratmobile, Throwing Muses and Sonic Youth. Corin Tucker's emotional vocals and the band's lyrics alternate between personal and political topics, rebelling against war, traditionalism, gender roles and consumerism from feminist and progressive perspectives. Sleater-Kinney contributed the protest song "Off With Your Head" to NOFX leader Fat Mike's "Rock Against Bush" compilation. In 2017, Sleater-Kinney contributed the single "Here We Come" to "7-Inches For Planned Parenthood", which is a compilation of 7-inch records and digital downloads whose proceeds went to Planned Parenthood.