** Audio streaming giant Spotify's SPOT.N shares fall 8.5% to $454 premarket
** SPOT expects Q2 operating income of 630 mln euros ($736.53 mln), below estimates of 684 mln euros - data compiled by LSEG
** Q2 forecast of 6 mln increase in premium subscribers to 299 mln below estimates of 302 mln
** Sees Q2 monthly active users to be 778 mln, above estimates of 773 mln
** Expects Q2 revenue of 4.8 bln euros, above analysts' avg. estimate of 4.77 bln euros
** Up to last close, stock has fallen 14.6% YTD
($1 = 0.8554 euros)
(Reporting by Anhata Rooprai in Bengaluru)
((Anhata.Rooprai@thomsonreuters.com))