Horn:

|----------------------------------------|
|------3--3-----3--3-----4--4-----4--4---|
|------4--4-----4--4-----5--5-----5--5---|
|----------------------------------------|
|----------------------------------------|
|---3--------3--------3--------3---------| Repeat

Trumpet:

|--------------------------------------------|
|---4p3--------------------------------------|
|-------5-4~--2h4-2-0--0h2-4-4~--4/5-4p2-0---|
|--------------------------------------------|
|--------------------------------------------|
|--------------------------------------------|

|------------------------------------------------------------|
|---------------------------------3~--3h5-3------------------|
|-------2-4~--4~-4/7--5-4~--5-4-5-----------5-4~--4-5~-2-4---|
|---4h5------------------------------------------------------|
|------------------------------------------------------------|
|------------------------------------------------------------|

Horn later during second singing part(takes some coordination):

|--------------------------------------------------------------------------|
|------3--3-----3--3-----4--4-----4--4-----3--3-----3--3-----4--4----4--4--|
|------4--4-----4--4-----5--5-----5--5-----4--4-----4--4-----5--5----5--5--|
|--------------------------------------------------------------------------|
|---------------------3--------------------------5--------3--------5-------|
|---3--------3-----------------5--------3----------------------------------|

Trumpet Again:

|------------------------------------------------|
|------------------------------------------------|
|---4--2~/-4~---5~--5/7-5-4~---4--2--4~---5--7---|
|------------------------------------------------|
|------------------------------------------------|
|------------------------------------------------|

Two Parts!!

Instrument 1:

|---3-3-3-3--3--3-3-3-3--3--3-3-3-3--3--3-3-3-3--3---|
|---3-3-3-3--3--3-3-3-3--3--4-4-4-4--4--4-4-4-4--4---|
|---4-4-4-4--4--4-4-4-4--4--5-5-5-5--5--5-5-5-5--5---|
|---5-5-5-5--5--5-5-5-5--5--5-5-5-5--5--5-5-5-5--5---|
|----------------------------------------------------|
|----------------------------------------------------|

Instrument 2:

|--------------------------------------------------|
|--------------------------------------------------|
|--------------------------------------------------|
|--------------------------------------------------|
|-------------3---3-3---3-------------3--3--3--3---|
|---3----3----------------3---3-3--3---------------|

|----------------------------------------------------|
|----------------------------------------------------|
|----------------------------------------------------|
|-----------------1-5---------------------1-5--------|
|-----2-5-------3-----3--3----2-5-------3-----3--3---|
|---3-----3--3--------------3-----3--3---------------|

|-----------------------------------------------------|
|-----------------------------------------------------|
|-----------------------------------------------------|
|-----------------1-5---1-5---------------1-5---1-5---|
|-----2-5---2-5-3-----3-------2-5---2-5-3-----3-------|
|---3-----3-----------------3-----3-------------------|

And so on...That's pretty much it.