I don’t understand the question?
BMG is a kind of Mercedes and Colombia House is coffee. I think. I’ve no idea either.
I think it’s the yanks assuming the internet is populated by yanks again
Columbia House and BMG were record clubs in the 1990s. This was a subscription service that regularly sent music album CDs to your house. They advertised in mailings, TV, radio, etc. It was ubiquitous.
The catalog for available records was quite vast. 
In order to get new customers, these record clubs had a loss leader marketing approach. You would get 5-10 CDs for only a penny for signing up, and you are not charged for the first month. After, there is a hefty cost. The CDs are yours to keep, but you need to cancel the membership before the first payment is due.
Word spread pretty fast that the deal was legit. For many of us kids pre-internet piracy, Columbia House represents the biggest album haul of that era.
I got like 6 free CDs, paid for one cd, then my mom found out, called them up and yelled and got me out of it. I was in 7th grade.
what are those things?
Those things were the analog Napster, the physical Limewire, so amazing.
Almost every physical CD I own to this day came from Columbia House and their random ass “get 12 CDs for five cents” ads.
The rest were either given to me by friends, found on the street, one is stolen (literally stole Steal This Album by SOAD from a Target when I was a madlad teenager), and the rest are burned from MP3s downloaded off the internet.