The F# minor pentatonic scale is one of the most useful five-note collections a guitarist can learn. It's the classic rock and blues soloing sound, and it's usually the first scale guitarists learn, with good reason. It's small enough to memorise in an afternoon, it sits comfortably under the fingers, and it's very hard to play a truly wrong note with it. Here's everything you need to start playing it right now.
"Pentatonic" simply means "five notes" (penta = five, tonic = tone). In F# minor pentatonic, those five notes are:
F#, A, B, C#, E
After E, the next note is F# again, one octave higher. An octave is the same note at a higher or lower pitch, like singing the same melody in a deeper or brighter voice.
F# is the root, the home note. It's where the scale starts, and it's where your melodies will want to come to rest.
A quick word on that sharp sign. F# ("F sharp") is the note one fret above F. You might also see the same pitch called Gb on some charts. Don't worry about that. This key is written with sharps, so every note here that needs one gets a # rather than a b. Just read the names as they are and you're fine.
Every scale is a pattern of distances between notes. On guitar, those distances are easy to see:
The minor pentatonic pattern is W+H - W - W - W+H - W. Starting from F#, it plays out like this:
You can try this on a single string. Play the low E string at fret 2 (that's F#), then frets 5, 7, 9, 12 and 14. You've just walked up the whole scale on one string, ending on F# an octave higher.
Musicians describe scales with a formula, numbers that show how far each note is from the root. For minor pentatonic it's 1, b3, 4, 5, b7. In F#, that means:
The note that gives this scale its moody, minor character is A, the minor 3rd. Play F# then A and listen. That slightly dark, bluesy feeling is the sound of "minor." The E, the minor 7th, adds a gritty, unresolved edge that's all over rock and blues solos.
The scale comes from the F# natural minor scale: F#, G#, A, B, C#, D, E. Take out the 2nd (G#) and the 6th (D) and you're left with F#, A, B, C#, E. Those two missing notes are the ones most likely to clash with chords, which is why the pentatonic feels so forgiving. Everything that's left sounds strong.
Here's a bonus: the A major pentatonic scale uses exactly the same notes. Start on A instead of F# and the same five notes take on a brighter, happier feel. Same shapes, different home.
You can build a couple of chords entirely from the notes of this scale:
Power chords, the two-note root-and-5th chords used all over rock, work great too. F#5 (F#, C#), E5 (E, B) and B5 (B, F#) all sit inside the scale.
A simple progression to start with: play F#m for four beats, then A for four beats, and repeat. Record it on your phone or ask a friend to strum it, then improvise over the top. For a heavier rock vamp, try alternating F#5 and E5.
Listen for how landing on F# feels like coming home, and how sitting on A over the A chord sounds sweet and settled.
On a standard-tuned six-string guitar, the root F# is easy to find:
The most common place to start is the box shape anchored at fret 2 on the low E string. Using your index finger at fret 2, play:
That's every note of F# minor pentatonic in one compact shape. Move the exact same shape up to fret 14 and it works there too, an octave higher, where many players prefer the feel for soloing.
Spend five minutes a day running the box shape at fret 2 slowly, up and down, saying the note names out loud as you go. Then put on that F#m to A loop and noodle freely, but make one rule: end every phrase on an F#. Within a week your fingers will know the shape, and your ears will start hearing where home is. That's when the fun really begins.
For the bigger picture, read The Minor Pentatonic Scale.