Day 17 is a song that you hear often on the radio. This one really depends on which radio station I am listening to.
If I am listening to the hip-hop station I often hear this song lately:
The Man Who Can't be Moved by The Script
If I am listening to the 'a little of everything' station I will often hear this one:
Rolling in the Deep by Adele
And...if I am listening to the rock station I will often hear this:
Jeremy by Pearl Jam
Day 18 is a song that you wish you heard on the radio. I'm sure it is on the radio I just haven't heard it yet, but I wish I heard this song on the radio everyday.
Lotus Flower by Radio Head