The Halcyon Days EP is the second official release by the English punk rock band Sounds of Swami.

After a positive EP review in an issue of TNS Zine, the Manchester zine started a record label TNSrecords and offered the band a one-off split record deal with two of their roster bands.

The songs emphasised their more hardcore punk side with influences including Bad Brains, Minor Threat, Black Flag, Gorilla Biscuits and Dead Kennedys affecting the overall sound of the EP.

The band approached TNSrecords about the project in the run-up to their first album and co-released the EP physically on 7-inch vinyl and digitally on iTunes.

To much surprise, Halcyon Days generated rave reviews on the underground punk circuit and gained high recognition from mainland Europe.