Ibanez Tube Screamer TS9
Rating: 4.5 / 5
The most copied overdrive on earth, and still the reference. Mid-focused, smooth, and magic in front of a pushed amp — the default "more" pedal for blues and rock.

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Pros
- Legendary mid-focused tone
- Brilliant as a boost in front of a driven amp
- Tightens high-gain amps
- Holds resale value
Cons
- Not much gain on its own
- Mid hump is not for everyone
- True-bypass fans dislike the buffer
Why it is a classic
The TS9 does one thing perfectly: it tightens and pushes an already-driven amp, adding sustain and a vocal midrange bump that helps leads cut through. As a standalone distortion it is mild, but as a boost or a tone-shaper it is unbeatable, which is why it has been on pro boards since the 1980s.
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It is also the go-to "tube-screamer in front of high gain" trick for metal — it does not add much gain, but it cleans up a flubby high-gain amp and tightens the low end beautifully.