The Sun Kil Moon version of "Convenient Parking, " from what might be Modest Mouse's best record, 1997's "The Lonesome Crowded West, " definitely gets the song's slow-burn intensity, teasing it out on his acoustic guitar as if over the course of making this record Isaac Brock's high-strung delivery has gotten under Kozelek's skin.

NPR: Sun Kil Moon: 'Tiny Cities'

The app does not record the speaker's words, said Dobson, but rather monitors the acoustic elements of their speech -- such as volume, intensity, pace and pitch -- to take an emotional reading.

CNN: STORY HIGHLIGHTS