The top three notes give us the b9th (Eb), the 3rd (F#) and the 13th (B). This Gmaj9 gives a nice finishing chord, meaning ...

Sus chords nearly always sound good when played before a major or minor chord that uses the same root note, Bsus4 to B, or Asus4 to A ... the D7 shape four frets higher to create a Bm7 and F#7 ...