From Sideways.

No One Is Alone

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Sources:

"Into the Woods from Stage to Screen" by Mark Eden Horowitz, in The Oxford Handbook of Musical Theatre Screen Adaptations

"Sondheim on Music" by Mark Eden Horowitz has a whole chapter on Into the Woods including a list of all of the leitmotifs that Sondheim used in the show

"Understanding the Leitmotif" by Matthew Bribitzer-Stull
I can’t recommend this book enough, I find myself combing through it over and over again

Snugboy’s video on adapting Into the Woods:
https://www.youtube.com/watch?v=87HsPiNbvcA

Sondheim (and Lapine)’s MTI Conversation Piece where they both discuss the show:
https://www.youtube.com/watch?v=NUN_MTChn5M

Sondheim discussing how he wrote Sweeney Todd:
https://www.youtube.com/watch?v=rKZGIwZvexw

Also, if you’ve got time, I’d highly recommend checking out Musical Hell’s video on the 2014 remake as well:
https://www.youtube.com/watch?v=SL3oFs6eMbg