Another notable example of is the introduction to The Beatles - Strawberry Fields Forever
https://www.youtube.com/watch?v=HtUH9z_Oey8
Mellotron for use as strings is sort of a staple for Beatles inspired artists, see many tracks by Elliott Smith on XO and Figure 8 as an example. Also see Radiohead OK Computer as it is on many tracks.
All the non-linearities with the tape playback gives them a really unusual quality.