What you are listening to is the use of the Software or hardware autotuner being used now as a vocal effect. It's become a pop music standard now completely transcending its original designed use. Its the rather bizarre 'warble' that is so prevalent in commercial recordings. Its the crossover point set at whichever notes are chosen in the programme. The song that sparked this train of use was a Cher chart hit (Do you believe in love?? Think thats the title)
Some twentyfive or more years ago, Mark Knoppfler brought to the fore the use of extreme in line compression as a sustain tool for the 'clean' electric guitar. It stuck! Once the genie is out of the bottle etc etc.