The Wikipedia web site below does say the Doors have 80 million record sales.
http://en.wikipedia.o...selling_music_artists
No mention of Engelbert on the list.
But note that the Doors career as a band virtually ended when lead singer Jim Morrison died and their only decent records were released while he was alive.
They only released 7 albums between 1966 and 1971 when Morrison died. These albums will account for most of the groups sales.
While the group (minus Morrison) have made albums and done tours without him the sales of records have been low.
However Engelbert has been performing since the mid 60s and is still alive producing records, so my guess is he has released dozens and dozens of albums, so his sales will have been spread over the last 50 years.
However 150 million record sales does seem a bit "generous".
p.s. I am old enough to remember when the Doors first came out and I remember buying their first two albums. At that time they were an "underground" band (as we called it at the time) and did not have much "main stream" support amongst general record buyers and were rarely played on the radio.
The song "Light My Fire" became a huge hit worldwide and got their name known, but Jim Morrison's problems with drink and drugs and the police harmed their career and they soon lost their reputation as a quality band.
I was walking through my local park a few months ago and saw a guy in his 30s I guess with a "Doors" T shirt on, which I found rather strange after me listening to them in the mid 1960s.
I still love "Light My Fire" and "Riders on the Storm".