Former Dr Who star Tom Baker has recorded a version of the Kinks' You Really Got Me for homeless children.
Tom Baker has been turned into a "virtual pop star"
Money raised from the song, which is only available by internet download, will help some 91,000 children in London at Christmas.
The tune was produced by BT, which aims to raise £100,000 for charity Shelter's work with young people.
"We've brought back Tom Baker...as a virtual pop star performing a new dance take on an old Kinks classic," said BT.
In addition to the Kinks remix, Baker's computerised voice will convert text messages sent to BT landlines into speech.
BT is donating 2p for every text message sent to or from a BT landline to Shelter until 8 January.
Adam Sampson, chief executive of Shelter, said: "It's shocking that, in the 21st Century, there are so many children in London waking up homeless on Christmas Day."