getArtists() {
  firebase.database().ref('/artists')
    .on('value', (data: DataSnapshot) => {
        this.ids = [];
        this.artistsWithId = data.val() ? data.val() : [];
        console.log(this.artistsWithId);
        for(var i=0; i < this.artistsWithId.length; i++){
          this.artistsWithId[i].map(data => {
            var mKey = data.key;
            var mValue = data.value;
            this.artists.push(mValue);
            this.ids.push(mKey);
          })
        }
          //this.ids.push(artist.uid);
        console.log(this.artists);
        this.emitArtists();
      }
    );
}