Which American singer that performed and co-wrote "Into You" collaborated on "My Favorite Part" with American rapper Mac Miller?
My Favorite Part: "My Favorite Part" is a song by American rapper Mac Miller, featuring guest vocals from American singer Ariana Grande. Into You (Ariana Grande song):  Grande co-wrote the song with Savan Kotecha, Alexander Kronlund, and its producers Max Martin and Ilya Salmanzadeh.
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