26 "Prelude / The Sound of Music" (Karaoke) (Barnes & Noble exclusive bonus track) - 2:43
27 "My Favorite Things" (Karaoke) (Barnes & Noble exclusive bonus track) - 2:16
28 "Do-Re-Mi" (Karaoke) (Barnes & Noble exclusive bonus track) - 5:30
29 "Edelweiss" (Karaoke) (Barnes & Noble exclusive bonus track) - 2:16

The elusive 45th anniversary edition of the Sound of Music with rare bonus tracks exclusive to a Barnes & Noble edition appears nowhere here nor anywhere else online, which is a bit shocking, especially for the fantastically curated collections that are on here.
So, there are many 45th anniversary editions that exist out there that simply do not include these tracks.
The rest of the soundtrack is what people have been enjoying for many, many years, but the above listed and redundantly listed down below songs appear in no other collection I can find.

Can you help me and the rest of the internet find them?

The 45th Anniversary of 'The Sound of Music' from Barnes & Noble Exclusively includes 4 entire tracks NOT on any other release, it would appear.

What tracks do I seek?

The OFFICIAL INSTRUMENTALS to 4 of the songs.
They are sometimes listed as 'Karaoke Versions'. Personally, I'm shocked that these 4 tracks are so hard to find. If I'm missing something obvious in find them out there, please inform me in a message.

26 "Prelude / The Sound of Music" (Karaoke) (Barnes & Noble exclusive bonus track) - 2:43
27 "My Favorite Things" (Karaoke) (Barnes & Noble exclusive bonus track) - 2:16
28 "Do-Re-Mi" (Karaoke) (Barnes & Noble exclusive bonus track) - 5:30
29 "Edelweiss" (Karaoke) (Barnes & Noble exclusive bonus track) - 2:16

Evidence of these :

http://www.barnesandnoble.com/w/the-sound-of-music-julie-andrews/158189;jsessionid=90C7AABEBD341B46E7E4333725753F90 .prodny_store02-atgap07?ean=0886978063229

[The above link provides 30 second previews to the tracks, showing that they are the official orchestral backing tracks to the aforementioned songs]

https://en.wikipedia.org/wiki/The_Sound_of_Music_%28soundtrack%29#45th_Anniversa ry_Edition

http://thesoundofmusic.wikia.com/wiki/List_of_The_Sound_of_Music_soundtracks

https://www.amazon.com/Sound-Music-Anniv-Various-Artists/dp/B004B6PGOE/175-7447054-7725910?ie=UTF8&camp=1789&creative=9325&creativeASIN=B004B6PGOE&linkCode=as2&redirect=true&ref_=as_li_qf_sp_asin_il_tl&tag=chronoscoress-20


Thank you.

Seconded.