From Lauren - November Hello - Lennon, Bird, Feather

Lauren alerted exchangers to the fact that November 21st is World Hello Day and sent a bluebird on the envelope and an actual feather on the card.

I'm wondering if there is a John Lennon song that says Hello - and if I am forgetting another obvious tie-in.

Below is the card.

Details on World Hello Day which recommends saying Hello to ten people once a year may be found here:

World Hello Day

I say *hello* to about 300 people every day right here...so there.