. . . but I can't seem to find it here in the forums. Maybe I am misremembering and this was a challenge from FAWM?
Anyway, I've written two predictive text songs, and I guess if anyone else wants to try this challenge you can tag your songs #predictive text.
You can either use the feature built into your mobile device's keyboard, where you type a word and it suggests what the next one should be, or use botnik.org's Voicebox to do something similar in your browser with a bot that's trained with different "voices", like Harry Potter narration or pancake recipes.