Does any one have any tips on tuning a 4 string to BF#BE?
Is that possible or is drop B only for 5 strings?
Are there any special strings I should get?

Sorry for the dumb questions, I'm not familiar at all with drop B. The lowest I've gone is drop C.
E -> down 2 1/2 tones -> B

A -> down 1 1/2 tones -> F#

D -> down 1 1/2 tones -> B

G -> down 1 1/2 tones -> E

You may want to use a higher string gauge than you do in EADG, to account for the lack of tension.
If you choose BEAD-strings, you will have to tune up the EAD-strings, and thats not recommended. Drop B is exactly like drop C, only 1 semitone lower on all strings. Buy slightly heavier gauge strings, and it's no problem.
Fler Ismaskiner!
Alright, thanks guys. I'll head down to my local music store tomorrow and get some heavier strings.
Get as heavy as you can for a four-string set, or a lighter set for a five-string. It's possible to take a five string set and tune up the strings, but you'd need fairly light strings for that. A .130 .090 .070 .055 gauged set would do fine for that tuning, but you'll need a setup. Cheers, Drop B is a good tuning.
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