 Voormann , a close friend of Harrison 's since 1960 , found the atmosphere at the sessions unpleasant ; he later cited the heavy drug use typical of the LA music scene , in particular , but also the ex @-@ Beatle 's " frame of mind when he was doing this album " . Keltner , who described his own friendship with Harrison as " like brothers " , has similarly spoken of Los Angeles as an unsuitable environment for Harrison during this period , while commenting that Arias " came into the picture at just the right time , a crazy , dark time " . With Voormann choosing to absent himself , Harrison played some of the album 's bass parts himself , using either ARP or Moog synthesizer . 
