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Deep Focus
Deep Focus is a soft chord pad in E flat, played low with the bright top taken off it. The bass leans into one ear and the higher notes into the other, so it spreads unevenly. It's named for what people play it during, not for anything it does to you.
Ready to play
Put this under rain or a fire, keep the blend you end up with, and play it through the night with your screen off. The Slo app does that on iOS, Android and Mac.
What the loop actually contains
What plays is one held chord that never moves on: an E flat with its thirds and fifths filled in, running from a deep bass note up into the pitch range where voices sit. The bright top is rolled away hard, and that's what gives the pad its muted, cushioned quality. The two sides don't match either: the deep bass note is strongest in the left ear, while one of the middle notes is strongest in the right.
A note on the name, and what to pair it with
The name describes the situation people reach for it in. It is not a claim about concentration, and nothing on this site supports one. What can be said is what the recording is: a quiet, unchanging, wordless chord with no rhythm and no events to catch the ear. Whether that suits your work is a question only trying it answers.
Nearby options: Flow is a plainer stack of octaves, Cosmic Drift is darker still, and Lullaby is the same idea in F major with far more bass. See them all on the sound library index, or open the Deep Focus and rain blend in the free sound mixer to put some movement over the top.
Frequently asked questions
Does Deep Focus improve concentration?
Nothing supports a claim of that kind, and this page does not make one. Its title reflects how people commonly use the track, not a measured effect. Play it if you like how it sounds.
What chord is it?
E flat, with its thirds and fifths filled in and the same notes repeated across about three octaves.
Why does it sound lopsided in headphones?
The two sides don't match. The deep bass note is loudest in your left ear and one of the middle notes is loudest in your right, so the balance shifts depending on which one you're following.
Is there a sleep timer?
Yes. Stop after 15, 30 or 60 minutes, choose all night, or leave the timer off.