Froggy, I would advise you against eating Pla Ra, as it is the main cause of liver cancer. I think you know.
There are many things I avoid eating when in Issan and this includes the raw beef as well. I know they love it but the risk of salmonella is there, so I usually reject any meat uncooked. I also avoid the cheap local Thai whisky.
Let me say a little about Isaan.
1. Officially Thailand is divided into 6 regions namely
a. Central Thailand - where Bangkok and 21 Provinces reside (population about 20 mil)
b. North Thailand - 9 provinces (population about 6.5mil)
c. South Thailand - 14 provinces (population about 9.5mil)
d. East Thailand - 7 provinces (population about 5mil)
e. West Thailand - 5 provinces (population about 3.5mil)
f. finally Northeast Thailand - 20 provinces (population about 22.5mil) now Northeast Thailand Region is convenient called Isaan
2. Although Northeastern Thailand Region is commonly called Isaan not all speak Isaan language or rather not all are Isaan people.
3. Just because maybe 80% are Isaan people this region is conveniently called Isaan but then Northeastern Thailand is a more accurate name.
4. Also note that all over Thailand once can find Isaan people especially in Bangkok I am sure with 10 mil people in the capital once can find jsut my guesstimation at least 3mil are Isaan? So the Isaan people is a very large group of ethnically unique group of people in Thailand.
5. So who are they? First, Isaan is ethnically Lao. They call themselves Lao, they call their language Lao, they also call their food Lao, they also call their culture Lao so basically they have to be Lao.
6. Isaan language is almost identical to the language spoken in Laos so both Laotians and Isaan people understand each other almost perfectly. On the other hand many Thais cannot understand Isaan language although there are similarities. Today due to schooling almost all Isaan speak Thai and Isaan too.
You can have a feel of the language here
7. So why are there so many Isaan or Laotians here in Thailand today? This is due to forced migration in the 18th century when Thailand is much bigger than it is today controlling Laos those days. There was a rebellion in Laos over Thailand's control and Thailand took a large chunk of the population across the Mekong river into Thailand to be slaves and settled them in Northeastern Thailand. Mekong river is today the boder between Thailand and Laos.
8. So today there are basically more Laotians in Thailand than in Laos (population 6.8mil vs 23-25mil Isaan), yes its strange.
9. As for music Isaan music is known as Morlam here's morlam for you