The artists/musicians that I cannot get enough has changed and continues to change with the passage of time.
In the past it has included Springsteen and Dylan, but my last true obsessions were with Lucinda Williams and The Cowboy Junkies. At one time Lucinda’s catalog was so limited that I was buying a lot of CDs by other artists and cover CDs that she appeared on, in order to make CDs consisting of tracks that featured her voice. At about the same time I probably would have given Steve Earle honorable mention in that category.
The phase of my life where I could not get enough of those last three particular artists ended 20 to 25 years ago, and since then I do not know that there are any artists that would meet that criteria, although there have been times I was listening to a lot of Linda Ronstadt or Patricia Barber or Jacintha or. . . . But I cannot honestly say that at this point in my life there are any artists that I simply cannot live without hearing, although there are several that I do enjoy listening to more frequently than others.