<Tr> <Th_colspan="2"> Music video </Th> </Tr> <Tr> <Td_colspan="2"> "Leave a Light On" on YouTube </Td> </Tr> <P> "Leave a Light On" is a song by Scottish singer - songwriter Tom Walker . It was released to digital retailers on 13 October 2017 . The song was co-written by Walker and Steve Mac . The song reached number one in France, and reached the top 10 in Austria, Belgium's Wallonia chart, Germany, Italy and Switzerland, while reaching the top 40 on Belgium's Flanders chart, Poland and the Netherlands . The song reached number seven in his native UK and number 34 on the Irish Singles Chart . </P> <Table> <Tr> <Th> Chart (2017--18) </Th> <Th> Peak position </Th> </Tr> <Tr> <Th> Austria (Ö3 Austria Top 40) </Th> <Td> </Td> </Tr> <Tr> <Th> Belgium (Ultratop 50 Flanders) </Th> <Td> </Td> </Tr> <Tr> <Th> Belgium (Ultratop 50 Wallonia) </Th> <Td> </Td> </Tr> <Tr> <Th> Czech Republic (Rádio Top 100) </Th> <Td> </Td> </Tr> <Tr> <Th> Euro Digital Songs (Billboard) </Th> <Td> </Td> </Tr> <Tr> <Th> France (SNEP) </Th> <Td> </Td> </Tr> <Tr> <Th> Germany (Official German Charts) </Th> <Td> 8 </Td> </Tr> <Tr> <Th> Hungary (Rádiós Top 40) </Th> <Td> 12 </Td> </Tr> <Tr> <Th> Hungary (Single Top 40) </Th> <Td> 8 </Td> </Tr> <Tr> <Th> Ireland (IRMA) </Th> <Td> 25 </Td> </Tr> <Tr> <Th> Italy (FIMI) </Th> <Td> 8 </Td> </Tr> <Tr> <Th> Latvia (Latvijas Top 40) </Th> <Td> 35 </Td> </Tr> <Tr> <Th> Netherlands (Dutch Top 40) </Th> <Td> 6 </Td> </Tr> <Tr> <Th> Netherlands (Single Top 100) </Th> <Td> 10 </Td> </Tr> <Tr> <Th> Poland (Polish Airplay Top 100) </Th> <Td> 37 </Td> </Tr> <Tr> <Th> Russia Airplay (Tophit) </Th> <Td> 14 </Td> </Tr> <Tr> <Th> Scotland (Official Charts Company) </Th> <Td> </Td> </Tr> <Tr> <Th> Slovakia (Rádio Top 100) </Th> <Td> 8 </Td> </Tr> <Tr> <Th> Slovakia (Singles Digitál Top 100) </Th> <Td> 54 </Td> </Tr> <Tr> <Th> Slovenia (SloTop50) </Th> <Td> 12 </Td> </Tr> <Tr> <Th> Sweden Heatseeker (Sverigetopplistan) </Th> <Td> </Td> </Tr> <Tr> <Th> Switzerland (Schweizer Hitparade) </Th> <Td> </Td> </Tr> <Tr> <Th> UK Singles (Official Charts Company) </Th> <Td> 7 </Td> </Tr> <Tr> <Th> US Adult Top 40 (Billboard) </Th> <Td> 20 </Td> </Tr> </Table>

Who sang i will leave a light on