Musician Wren
Cyphorhinus arada
The musician wren is 12.5 cm (4.9 in) long and weighs 18 to 24 g (0.63 to 0.85 oz). The adult of the nominate subspecies has a rufous forehead and forecrown that darkens to chesnut brown to the rear. It has a narrow pale buff supercilium with narrower black borders, a chestnut brown stripe behind the eye, and orange-brown cheeks. It has a broad "collar" streaked black and white lengthwise on its nape and upper back. The lower back and rump are a colder reddish brown than the crown and the tail is medium brown with narrow darker brown bars. Voice: Members of a musician wren pair sing antiphonally, "a series of clear, haunting whistles, varying greatly in pitch". The call is "a harsh 'churk'".
ID text from Wikipedia, CC BY-SA 4.0

Song Wren
Cyphorhinus phaeocephalus
The song wren is 11.5 to 12.5 cm (4.5 to 4.9 in) long and weighs 25 to 26 g (0.88 to 0.92 oz). Its body is nearly uniformly brown, though sometimes paler on the breast. It has a chestnut throat and black bars on the wings and its very short tail. It has a patch of bare blue skin around the eye. The subspecies have some variations in color and intensity, and extensive descriptive details can be found in Pollock and Agin (2020). Voice: The song wren's song has been described as "clear, melodious whistles superimposed on harsh, henlike clucking". Both sexes sing year round to defend a territory. Variations in song between the sexes and in different parts of the range have been noted but not systematically studied.
ID text from Wikipedia, CC BY-SA 4.0

Where you might meet both
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Play today's Daily BirdPhotos and recordings are credited to their authors under the licence shown. Full profiles: Musician Wren and Song Wren.