Well, it's included in these collected works: http://www.worldcat.org/title/ausrelei-beaustant-28-liaudies-dainos-misram-chorui/oclc/392312716
Can't find it online atm, but someone with access to the Stanford University library could help you out. I'd love a copy :)
There is a downloadable program called MuseScore that allows you to create and edit sheet music. Its what I used throughout high school to help me with parts I couldn’t pick out on a piano. :)
A quick search led me to this: https://musescore.com/user/103279/scores/4990972
Basically, somebody has already transposed the sheet music for Heyr into a downloadable format. If you download the file above and get the program, you can open the file in the program and should be able to go to Display > Mixer and adjust which parts you hear. You should be able to adjust the tempo as well. There are plenty of online guides to help you navigate the program.
Here’s the download link for MuseScore: https://musescore.org/en/download
Hope this helps!
Looks like it's "Heavens Gate" from Nature and Virtual Sounds Tour. Seems like it's basic clip from a sound library
I’m not super familiar with SmartMusic but I’m sure it has some function that can help you out. Another option is to have your choir director or a choir mate make some recordings of your part to practice with and repay them with baked goods.
However, in my opinion, these are cop-outs and/ or short term solutions. You don’t have to be a piano expert to plunk out a few pitches. music theory.net has some great tools for doing this. I’ll link my favorite sight-singing book below if you’re willing to spend some money. Learning solfège and writing it in your music is helpful as well. These things will make you a better musician in the long run.
Actually, in addition to my comment above, I'm going to go as far as to disagree entirely with you. Christ Church Oxford (where I sing regularly) recorded Palestrina's "Mass for Pentecost and motets" in 1988 and Sicut Cervus is there with it. If OP would like some other suggestions for Renaissance music or just texts appropriate to the day (which then might have been set by other people), this CD isn't the worst place to start.
Plus, I think Sicut Cervus is great, even if the Howells setting is a million times better :-)
LMMS might, haven't used it, but it looks like it has MIDI features and a mixer... albeit somewhat complicated interface
Not helpful to you, OP, but GarageBand will do this on Mac.
This isn't exactly what you're asking for, but I bought this three ring binder insert for my iPad. This allows it to be inserted into a choir folder's 3-ring adapter. Looks like it isn't available on Amazon currently but there may be similar options out there.
The complete set of Fourteen Tolkien Songs for Children’s Voices in vocal score (voice parts with piano accompaniment) is available from Amazon: http://www.amazon.com/Fourteen-Tolkien-Songs-Childrens-Voices/dp/1492187534/ref=sr_1_4?ie=UTF8&qid=1435952494&sr=8-4&keywords=charles+mccreery
I've been trying out Mobile Sheets recently which allows you to import a pdf and then attach a midi or mp3 to each movement.
It take a bit of getting used to and you'll need to download and attach the sound files manually, but once you've got it setup it works ok.
There is an 8 piece limit to the free version and then it's about £10 to purchase. I've been working with it in rehearsals too but haven't yet made the leap to using for performance as that would be a bit beyond my risk appetite.
Works well on anything around 10 inches and upwards...