4 June 2013 Last updated at 14:32 ET By David Cornock BBC Wales Parliamentary correspondent
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Mike Peters played at parliament as some MPs signed the donor register
Mike Peters is a survivor. Lead singer of The Alarm since 1981, he's had 15 UK Top 40 hits and sold more than five million records.
He's also a cancer survivor, twice, and in that role he came to parliament today as part of a drive to increase the number of stem cell donors.
A day after receiving chemotherapy treatment near his home in north Wales, he headed to Westminster for the launch of "Get On The List", a campaign to recruit potential donors.
MPs were targeted at a donor registration event in the hope that they would encourage others to register to help blood cancer patients.
The campaign sees Peters' Love Hope Strength Foundation join forces with Delete Blood Cancer UK charity, which says that half the people in Britain who need a life-saving stem cell donor don't actually find a suitable match.
People are realising that one day it could be someone that they know who needs a stem cell donor,
The register is open to anyone between the ages of 17 and 55, if they are in good general health. Fans of The Alarm have been recruited during the band's tours.
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Singer targets stem cell donors