The Reed Warbler has a reddish brown colour, the Marsh Warbler is grey-brown. The Reed Warbler sings a rather simple, scratchy song. The Marsh Warbler has a long and complicated song.
The Sedge Warbler has a bright, white eyestripe and a striped body. The Reed Warbler is plain brown.
The Reed Warbler is smaller and sings higher in tone. The Great Reed Warbler is louder en more rough in its song.