“If you were listening to any kind of normal radio in the early 90s, you remember ‘Baby, Baby,’ which hit No. 1 on the Billboard Hot 100, as well as ‘Every Heartbeat,’ which hit No. 2. ‘That’s What Love Is For,’ ‘Good For Me’ and ‘I Will Remember You’ all were Top 20 hits as well,” (Daily Vault).
The best part about (1991’s Heart in Motion) … is not the success it brought Grant as much as the way it openly addressed important issues in life. ‘Ask Me’ talks about how faith can help heal a person’s past, specifically child abuse; ‘That’s What Love Is For’ addresses that relationships are tough and take work. Strength and hope are the themes of Heart in Motion … The simplicity of Grant’s voice with her honest lyrics contrast what so many other big names (Mariah Carey, Whitney Houston, Christina Aguilera) attempt to achieve.”
“That’s What Love is For” begins in E major, building gradually through its first two verses. The chorus, in C# major, then appears with great fanfare at 1:08; the video further obliges the mood change with a shift from black and white to full color. At 1:42, we dive back into another verse — in the original key and the original black and white! The pattern continues until 3:04, when we stumble into D major as we hop over yet another B+W/color border.