online store prior to your visit to get an idea of what you'll see there. It's a bit more expensive than other CDs (around 150b) but they do a great work. They only have a bunch of Esan music but I guess most of you would also want to buy other vintage luk thung CDs.
"Pahuarat", you can walk around, there are a bunch of shops selling some Indian music (mostly some Bollywood of all kinds and some religious music). You can take away some good quality Indian pastries in the shops located in the small streets in front or at the back of the India emporium shopping mall. If you are vegetarian, there are lots of nice places to eat around too.
2018 UPDATE: 4 of the listed shops closed already still It remain the best area to find music in BKK. The best shop in the area is actually not listed as you would get lost trying to find it but if you really want to try, contact me and I'll help you.