[citation needed] As well as a deep-rooted sense of tradition, rebel songs have nonetheless remained contemporary, and since the end of the Irish Civil War in 1923, the focus has moved onto the nationalist cause in Northern Ireland and the Irish Free State, including support for the Anti-Treaty IRA, the Provisional IRA, the INLA, and Sinn Féin.
Over the years, a number of bands have performed "crossover" music, that is, Irish rebel lyrics and instrumentation mixed with other, more pop styles.
The Bog Savages of San Francisco are fronted by an escapee from Belfast's Long Kesh prison who made his break in the September 1983 "Great Escape" by the IRA.
More recently, Derek Warfield's music was banned from Aer Lingus flights, after the Ulster Unionist politician Roy Beggs Jr compared his songs to the speeches of Osama bin Laden.
The 1988 concert film Rattle and Hum includes a performance hours after the 1987 Remembrance Day bombing in Enniskillen, which Bono condemns in a mid-song rant.