public async Task <ActionResult <IEnumerable <ArtistResource> > > GetAllArtists()
        {
            try
            {
                var artists = await _artistService.GetAllWithMusic();

                if (artists == null)
                {
                    return(BadRequest("There is no artist."));
                }

                var artistsResources = _mapperService.Map <IEnumerable <Artist>, IEnumerable <ArtistResource> >(artists);
                return(Ok(artistsResources));
            }
            catch (Exception ex)
            {
                return(BadRequest(ex.Message));
            }
        }