Poland's Solidarity trade union movement and the early anti-communist
movement have a lasting place in the memory of many Poles. But the way in
which workers' protests or the birth of Solidarity, are celebrated, is
changing. The anniversaries are no longer limited to speeches and
religious services - instead rock stars are in on the act. Two Pink Floyd
members Roger Waters and David Gilmour have performed in cities closely
associated with Poland's struggle to shake off communism. More from Michal
Zajac: