Oh crikey, I looked up the song Under Pressure on YouTube and there is NO way that is a beginning song!
I teach piano, and I have looked at some teacher and lesson websites that offer, "Learn to play your favorite song in only two lessons! Learn to read music in 15 minutes! Easy way and cheap pay and play!"
It takes years to really get to where you can transpose into different keys to "match" other instruments, and to sight read music, to develop a strong sense of rhythm, yet stay together, and so much more. And solo and ensemble playing are different skill sets, as is accompanying.
For example, just this evening, my 17 year old son who has made High School All State for trumpet for three years got it into his head that he wanted to play the BBC Sherlock Holmes music, but he did not like the key it was in. He transposed it on staff paper, and checked his work with me and a couple of videos of the music. It took maybe 30 minutes of concentrated work to be sure he had all the correct intervals and accidentals, and then he added a few bits for fun.
To be TOLD he was going to? Well, that would be met with strong resistance, no matter that he has the skills and knowledge and instruments.
I would rather have the matriarch suggest a group painting, where each person is given one portion of something to paint, and then all the pieces are put together into one masterpiece.
OP, how did it go??