Julia Jack­lin stands on stage at The Louisiana in Bris­tol as motion­less as a stat­ue, clos­es her eyes and man­ages to hush the entire room. All eyes are upon her as she starts to sing. There is a mes­meris­ing qual­i­ty to her voice, some­thing about the rich, dreamy swoop­i­ness which suits the Australian’s alt– coun­try indie folk mate­r­i­al. Then there’s her abil­i­ty to…