[CC1.73] Crash when entering nether portal while a computer is playing a music disk

The reason I suspect it's caused by the computer (an advanced turtle really) is the following in my crash report:

[12:44:56] [Client thread/WARN]: Invalid sounds.json
com.google.gson.JsonSyntaxException: com.google.gson.stream.MalformedJsonException: Expected name at line 4 column 2
    at com.google.gson.Gson.fromJson(Gson.java:818) ~[Gson.class:?]
    at com.google.gson.Gson.fromJson(Gson.java:768) ~[Gson.class:?]
    at net.minecraft.client.audio.SoundHandler.func_110549_a(SourceFile:78) [btp.class:?]
    at com.mumfrey.liteloader.client.SoundHandlerReloadInhibitor.unInhibit(SoundHandlerReloadInhibitor.java:107) [SoundHandlerReloadInhibitor.class:1.7.10_04]
    at com.mumfrey.liteloader.client.LiteLoaderCoreProviderClient.onStartupComplete(LiteLoaderCoreProviderClient.java:72) [LiteLoaderCoreProviderClient.class:1.7.10_04]
    at com.mumfrey.liteloader.core.event.HandlerList$CoreProvider0.onStartupComplete(HandlerList$CoreProvider0.java:100) [?:1.7.10_04]
    at com.mumfrey.liteloader.core.LiteLoader.onStartupComplete(LiteLoader.java:909) [LiteLoader.class:1.7.10_04]
    at com.mumfrey.liteloader.core.Events.onStartupComplete(Events.java:95) [Events.class:1.7.10_04]
    at com.mumfrey.liteloader.client.ClientEvents.onStartupComplete(ClientEvents.java:260) [ClientEvents.class:1.7.10_04]
    at com.mumfrey.liteloader.client.CallbackProxyClient.onStartupComplete(CallbackProxyClient.java:48) [CallbackProxyClient.class:1.7.10_04]
    at com.mumfrey.liteloader.core.event.EventProxy.$event00000(EventProxy.java:211) [EventProxy.class:1.7.10_04]
    at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:573) [bao.class:?]
    at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:867) [bao.class:?]
    at net.minecraft.client.main.Main.main(SourceFile:148) [Main.class:?]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.7.0_75]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) ~[?:1.7.0_75]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.7.0_75]
    at java.lang.reflect.Method.invoke(Method.java:606) ~[?:1.7.0_75]
    at net.minecraft.launchwrapper.Launch.launch(Launch.java:135) [launchwrapper-1.11.jar:?]
    at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.11.jar:?]
Caused by: com.google.gson.stream.MalformedJsonException: Expected name at line 4 column 2
    at com.google.gson.stream.JsonReader.syntaxError(JsonReader.java:1505) ~[JsonReader.class:?]
    at com.google.gson.stream.JsonReader.doPeek(JsonReader.java:494) ~[JsonReader.class:?]
    at com.google.gson.stream.JsonReader.hasNext(JsonReader.java:403) ~[JsonReader.class:?]
    at com.google.gson.internal.bind.MapTypeAdapterFactory$Adapter.read(MapTypeAdapterFactory.java:184) ~[MapTypeAdapterFactory$Adapter.class:?]
    at com.google.gson.internal.bind.MapTypeAdapterFactory$Adapter.read(MapTypeAdapterFactory.java:145) ~[MapTypeAdapterFactory$Adapter.class:?]
    at com.google.gson.Gson.fromJson(Gson.java:803) ~[Gson.class:?]
    ... 19 more

MC 1.7.10 / Forge 1291 / CC 1.73

Here's the full Forge log: http://pastebin.com/phusC9YU http://pastebin.com/Ks799nn6

This isn't related to CC. It means your sounds.json is malformed.

Looks like due to liteloader.

There's no ComputerCraft at all in that crashlog.