I am an odd number. Take away a letter and I become even. What number am I?

You will see me all over buildings and computer screens. Open me and plenty of new things will be seen. At the end of each day I go pitch black.

Long and hungry, I carry a spark, I’m wrapped in a jacket so I don't get dark. Don't mix my colors, that causes a fright, set me up proper and you'll have a light. Set me up wrong and oh what a ding, Zip zap and pop, a short song I sing!

I can rock a stage or measure the sky, help surgeons cut or pilots fly. I make sweet sounds or precise intent, depends who’s holding me.

You may be quick to throw me away. I come by means of web. I come by means of can. Some may think of me as a delicacy.