Sourcing and selecting appropriate music for small choirs can be difficult. Here you’ll find a number of pointers and even some free resources.

Sunday by Sunday – The RSCM publishes a resource entitled Sunday by Sunday. This is an excellent way of finding music appropriate to a particular season or Sunday in the the year. It’s a resource that is available to members but some material is available free of charge.

The ChoralWiki, Choral Public Domain Library (CPDL) is a great resource of free material, but you need to know what you’re looking for first. If it’s commonly in use and out of copyright (the composer / arranger died more than 70 years ago) then you may very well find it here.

Some resources recommended by Herefordshire Churches

AdventWhen all is dark – Charlston Creator of the stars of night  
Advent Prose (plainsong)
Many more suggestions here
Unaccompanied

Plainchant
Christmas  
Lent / PassiontideO saviour of the world – GossSimple 4-part with or without organ
EasterNow the green blade riseth *     O sons and daughters – Walford DaviesIn many hymn books – can be sung in harmony, unison unaccompanied, with a simple drone (tonic and fifth) Simple plainchant version in many hymnbooks, or choir version by Davies
CommunionAve verum – Elgar  
Panis angelicus – Franck    
Simple anthem, which can be simplified further if needs be
For two voices or more.
ThanksgivingLocus iste – Bruckner
Psalm 150 – Stanford
Unaccomp satb
SATB + organ – easy, impressive
HarvestNow the green blade * see above
Thou visitest the earth – Greene
 
RemembranceKontakionMoving, 4-part harmony
FuneralPsalm 121 – I will lift mine eyes- Walford DaviesBeautiful, simple setting, performance options flexible
WeddingJesu, Joy of man’s desiring – Bach 

All the PDFs below are free from copyright restrictions. Either they are out of copyright or composers have given permission for them to be used freely.