diff --git a/src/lib/csound/execution-context.ts b/src/lib/csound/execution-context.ts
index 594b25d..d55a66f 100644
--- a/src/lib/csound/execution-context.ts
+++ b/src/lib/csound/execution-context.ts
@@ -4,6 +4,7 @@ export type EvalSource = 'selection' | 'block' | 'file';
 
 export class ExecutionContext {
   private contentProvider: (() => string) | null = null;
+  private initialized = false;
 
   constructor(private csound: CsoundStore) {}
 
@@ -12,7 +13,7 @@ export class ExecutionContext {
   }
 
   /**
-   * Execute entire file
+   * Execute entire file (composition mode: full restart)
    */
   async executeFile(): Promise<void> {
     const content = this.contentProvider?.() ?? '';
@@ -20,29 +21,66 @@ export class ExecutionContext {
       return;
     }
 
+    this.initialized = false;
     await this.csound.stop();
-    await this.csound.evaluateCode(content);
+    await this.csound.evaluate(content);
   }
 
   /**
-   * Execute code block (instrument, opcode, or paragraph)
+   * Execute code block (live coding mode: incremental evaluation)
    */
   async executeBlock(code: string): Promise<void> {
     if (!code.trim()) {
       return;
     }
 
-    await this.csound.evaluateCode(code);
+    if (!this.initialized) {
+      await this.csound.restart();
+      this.initialized = true;
+    }
+
+    await this.evaluateCodeBlock(code);
   }
 
   /**
-   * Execute selected text
+   * Execute selected text (live coding mode: incremental evaluation)
    */
   async executeSelection(code: string): Promise<void> {
     if (!code.trim()) {
       return;
     }
 
-    await this.csound.evaluateCode(code);
+    if (!this.initialized) {
+      await this.csound.restart();
+      this.initialized = true;
+    }
+
+    await this.evaluateCodeBlock(code);
+  }
+
+  /**
+   * Smart detection and evaluation of code blocks
+   */
+  private async evaluateCodeBlock(code: string): Promise<void> {
+    const trimmed = code.trim();
+
+    // Score event detection: starts with i, f, e, or a
+    // Examples: "i 1 0 1", "f 1 0 8192 10 1", "e", "a 0 0 1"
+    if (/^[ifea]\s+[\d\-]/.test(trimmed)) {
+      await this.csound.sendScoreEvent(trimmed);
+      return;
+    }
+
+    // Channel assignment detection: "varname = value"
+    // Examples: "gkFreq = 440", "gkAmp = 0.5"
+    const channelMatch = trimmed.match(/^(\w+)\s*=\s*([\d\.\-]+)/);
+    if (channelMatch) {
+      const [, channelName, valueStr] = channelMatch;
+      await this.csound.setControlChannel(channelName, parseFloat(valueStr));
+      return;
+    }
+
+    // Default: orchestra code (instrument definitions, opcodes, etc.)
+    await this.csound.compileOrchestra(trimmed);
   }
 }