Scales to Play Over Bmaj9
Every chord is a subset of several scales: any scale that contains all of a chord's tones fits over it. Pick a chord to see the matching scales from its own root, the major keys the chord belongs to, and full fretboard diagrams for every scale on guitar.
A Bmaj9 chord contains the notes B – C# – D# – F# – A#. Any scale that includes every one of those 5 tones fits over it — from the root B, that means B Major, B Lydian and B Mixolydian Bebop. Start with the first scale listed: it is the most common choice, and the others color the same chord tones differently.
Bmaj9 is also diatonic to 2 major keys: B major (relative minor G#m), F# major (relative minor D#m). In a song from one of those keys you can also solo with the key's own major scale or its relative minor pentatonic across the whole progression, not just this chord.