Teacher, blues singer and friend

The great tit has a variety of calls but the most easily recognised is the teechah teechah teechah song.  This has earnt him the name 'teacher bird'.

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The Blue Tit's song is less easy to describe.  
The alarm call is a rather grumpy chatter like a machine gun.

The 'song', such as it is, is described by Tim Lee of the 'Friends of Aston's Eyot' as 

Blue Tee Tee Tee Tit Tit Tit.

Try Tim's helpful mnemonics for birdsong via this link:

http://friendsofastonseyot.org.uk/wp-content/uploads/2015/01/bird-song-tips-pdf.pdf

There is also a  'blue-blue' call    'blue-blue      blue-blue'

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The smaller, Coal Tit's song is a bit like the Great Tit's but more wistful, like 'fitchew fitchew fitchew'.  It's rather more shy and retiring and can often be found in a conifer tree.