ɪn tˈuː θˈaʊzənd θˈɜːtiːn, smˈɪθ kəntɹˈɪbjuːɾᵻd vˈoʊkəlz fɚðə sˈɔŋ "lˈʌks lˈɪsbən" baɪ dʒˈɜːmən ɹˈæpɚ kˈæspɚɹ ˌɔn hɪz ˈælbəm hˈɪntɚlənd.
In 2013, Smith contributed vocals for the song "Lux Lisbon" by German rapper Casper on his album Hinterland.