ionViewDidLoad() {
    this.searchInput.valueChanges
      .filter((term) => {
        this.showSpinner = true
        this.isError = false;
        if (term) {
          return term
        } else {
          this.listing = [];
          this.showSpinner = false;
        }
      })
      .debounceTime(500)
      .distinctUntilChanged()
      .subscribe(
      term => this.spotify.load(term)
        .subscribe(
        results => this.listing = results.tracks.items,
        err => console.log(err),
        () => {
          this.showSpinner = false
        })
      )
  }