diff --git a/os_traits/compute/sound.py b/os_traits/compute/sound.py
new file mode 100644
index 0000000..c91dece
--- /dev/null
+++ b/os_traits/compute/sound.py
@@ -0,0 +1,27 @@
+# -*- coding: utf-8 -*-
+
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+
+TRAITS = [
+    # Traits corresponding to the allowed values of "hw_sound_model"
+    # image metadata property. These are used by the nova libvirt driver and
+    # are listed at https://libvirt.org/formatdomain.html#sound-devices
+    'MODEL_SB16',
+    'MODEL_ES1370',
+    'MODEL_PCSPK',
+    'MODEL_AC97',
+    'MODEL_ICH6',
+    'MODEL_ICH9',
+    'MODEL_USB',
+    'MODEL_VIRTIO'
+]
diff --git a/os_traits/compute/usb.py b/os_traits/compute/usb.py
new file mode 100644
index 0000000..b6be0d9
--- /dev/null
+++ b/os_traits/compute/usb.py
@@ -0,0 +1,23 @@
+# -*- coding: utf-8 -*-
+
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+
+TRAITS = [
+    # Traits corresponding to the allowed values of "hw_usb_model"
+    # image metadata property. These are used by the nova libvirt driver
+    # however we have decided for now to not support the other older options
+    # for performance and support reasons. Options are documented at
+    # https://libvirt.org/formatdomain.html#controllers
+    'MODEL_QEMU_XHCI',
+    'MODEL_NEC_XHCI'
+]