The British singer has recorded new tracks for the repackaged release of his hit album In The Lonely Hour, and he admits one particular tune, titled Drowning Shadows, is a real heartbreaker.

"It's the least radio-friendly song," he told Zane Lowe's Beats 1 World Record radio show. "This is proper, really dark.

"It's so important for me to make soulful, true, artistic music and actually to make a point that I'm not going to do a repackage and put on there a massive, massive single that's hopefully going to boost album sales. Drowning Shadows is the saddest song I have ever written."

The original version of the album achieved international success, going six-times platinum in the U.K. and two-times platinum in the U.S., as well as earning Sam a Grammy Award for Best Pop Vocal Album.

The singer wants to give fans one last batch of heartfelt songs to absorb before he begins a hiatus.

"I found myself recently pressing myself to write songs," he explained. "You've got to have these songs to cement the rest of your career, but there's a moment where I sit back and think, 'Actually, all my dreams have come true, I'm just living the most beautiful life at the moment, so why don't I sit back, enjoy myself, take a breath, kiss some more boys and write some more songs?'"

Sam plans to head home and spend time with his family and give himself a chance to take in the whirlwind of his achievements from the last couple of years.

"I've been going now for three years non-stop and it feels right for me to just go home and just live my life and be a 23 year old," he told ET Online last month (Oct15).